diff --git a/python/day12/bsp.txt b/python/day12/bsp.txt
new file mode 100644
index 0000000..433e0d2
--- /dev/null
+++ b/python/day12/bsp.txt
@@ -0,0 +1,5 @@
+Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi
\ No newline at end of file
diff --git a/python/day12/day12_1.py b/python/day12/day12_1.py
new file mode 100644
index 0000000..51761c3
--- /dev/null
+++ b/python/day12/day12_1.py
@@ -0,0 +1,89 @@
+lines = open("input.txt", "r").read().splitlines()
+
+relief = []
+s = None
+e = None
+for i, line in enumerate(lines):
+    els = []
+    for j, letter in enumerate(line):
+        if letter == "S":
+            els.append(1)
+            s = (i, j)
+        elif letter == "E":
+            els.append(26)
+            e = (i, j)
+        else:
+            els.append(ord(letter) - 96)
+    relief.append(els)
+
+
+class Node:
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+        self.g = 999999
+        self.h = (e[0] - self.x) + (e[1] - self.y)
+
+        self.parent = None
+
+    def f(self):
+        return self.g + self.h
+
+    def get_children(self):
+        children = []
+        if self.x != 0 and relief[self.x][self.y] + 1 >= relief[self.x - 1][self.y]:
+            children.append(Node(self.x - 1, self.y))
+        if (
+            self.x != len(relief) - 1
+            and relief[self.x][self.y] + 1 >= relief[self.x + 1][self.y]
+        ):
+            children.append(Node(self.x + 1, self.y))
+        if self.y != 0 and relief[self.x][self.y] + 1 >= relief[self.x][self.y - 1]:
+            children.append(Node(self.x, self.y - 1))
+        if (
+            self.y != len(relief[0]) - 1
+            and relief[self.x][self.y] + 1 >= relief[self.x][self.y + 1]
+        ):
+            children.append(Node(self.x, self.y + 1))
+        return children
+
+
+def a_start_search(start, goal):
+    start_node = Node(start[0], start[1])
+    start_node.g = 0
+    openSet = [start_node]
+    while len(openSet) > 0:
+        current_index, current_node = get_smallest_f(openSet)
+        if current_node.x == goal[0] and current_node.y == goal[1]:
+            return current_node.g
+        openSet.pop(current_index)
+        for child in current_node.get_children():
+            tentative_gScore = current_node.g + 1
+            if tentative_gScore < child.g:
+                child.parent = current_node
+                child.g = tentative_gScore
+                if not_in_set(child, openSet):
+                    openSet.append(child)
+    return None
+
+
+def get_smallest_f(openset):
+    smallest = 999999
+    smallest_node = None
+    smallest_idx = 99999
+    for idx, node in enumerate(openset):
+        if node.f() < smallest:
+            smallest = node.f()
+            smallest_node = node
+            smallest_idx = idx
+    return smallest_idx, smallest_node
+
+
+def not_in_set(node, openset):
+    for n in openset:
+        if n.x == node.x and n.y == node.y:
+            return False
+    return True
+
+
+print(a_start_search(s, e))
diff --git a/python/day12/day12_2.py b/python/day12/day12_2.py
new file mode 100644
index 0000000..e69de29
diff --git a/python/day12/input.txt b/python/day12/input.txt
new file mode 100644
index 0000000..3bff85e
--- /dev/null
+++ b/python/day12/input.txt
@@ -0,0 +1,41 @@
+abaaaaacaaaacccccccccaaaaaaccccccccccccccccccccccccccccccccccaaaaaa
+abaaaaacaaaaccccaaaaaaaaaacccccccccccccccccccccccccccccccccccaaaaaa
+abaaacccaaaaccccaaaaaaaaaaacccaacccccccccccaacccccccccccccccccaaaaa
+abaaaacccaacccccaaaaaaaaaaaaaaaaacccccccccccacccccccccccccccccccaaa
+abacaacccccccccccaaaaaaaaaaaaaaaaccccccccccaacccccccccccccccccccaaa
+abcccacccccccccccaaaaaaaccaaaaaaaccccccccccclllcccccacccccccccccaac
+abccccccccccccccccaaaaaccccccccccccccccccclllllllcccccccccccccccccc
+abaaacccccccccccccaaaaaccccccccccccccccaakklllllllcccccccccaacccccc
+abaaacccccccccccacccaaaccccccccccccccccakkklpppllllccddaaacaacccccc
+abaaacccaaacccccaacaaaccccccccccccccccckkkkpppppllllcddddaaaacccccc
+abaacccaaaacccccaaaaaccccccccccccccccckkkkpppppppllmmddddddaaaacccc
+abaaaccaaaaccccccaaaaaacaaacccccccccckkkkpppuuuppplmmmmdddddaaacccc
+abaaacccaaaccccaaaaaaaacaaaaccccccckkkkkoppuuuuuppqmmmmmmdddddacccc
+abcccccccccccccaaaaaaaacaaaacccccjkkkkkooppuuuuuuqqqmmmmmmmddddcccc
+abccccccccccccccccaaccccaaaccccjjjjkoooooouuuxuuuqqqqqqmmmmmddecccc
+abacaaccccccccccccaacccccccccccjjjjoooooouuuxxxuvvqqqqqqqmmmeeecccc
+abaaaacccccccacccaccccccccccccjjjjoootuuuuuuxxxyvvvvvqqqqmmmeeecccc
+abaaaaacccccaaacaaacccccccccccjjjoooottuuuuuxxyyvvvvvvvqqmnneeecccc
+abaaaaaccaaaaaaaaaaccccccccaccjjjooottttxxxxxxyyyyyyvvvqqnnneeecccc
+abaaaccccaaaaaaaaaacccccccaaccjjjoootttxxxxxxxyyyyyyvvqqqnnneeecccc
+SbcaaccccaaaaaaaaaaccccaaaaacajjjnnntttxxxxEzzzyyyyvvvrrqnnneeccccc
+abcccccccaaaaaaaaaaacccaaaaaaaajjjnnntttxxxxyyyyyvvvvrrrnnneeeccccc
+abcccccccaaaaaaaaaaacccccaaaaccjjjnnnnttttxxyyyyywvvrrrnnneeecccccc
+abcccccccccaaaaaaccaccccaaaaaccciiinnnnttxxyyyyyyywwrrnnnneeecccccc
+abccccccccccccaaacccccccaacaaaccciiinnnttxxyywwyyywwrrnnnffeccccccc
+abccccccccccccaaacccccccaccaaaccciiinnnttwwwwwwwwwwwrrrnnfffccccccc
+abccccccccccccccccccccccccccccccciiinnnttwwwwsswwwwwrrrnnfffccccccc
+abaaaccaaccccccccccccccccccccccccciinnnttswwwssswwwwrrroofffacccccc
+abaaccaaaaaacccccccccccccccccaaacciinnntssssssssssrrrrooofffacccccc
+abaccccaaaaacccccccaaacccccccaaaaciinnnssssssmmssssrrrooofffacccccc
+abaacaaaaaaacccccccaaaaccccccaaaaciiinmmmssmmmmmoosroooooffaaaacccc
+abaaaaaaaaaaaccccccaaaaccccccaaacciiimmmmmmmmmmmoooooooofffaaaacccc
+abcaaaaaaaaaaccccccaaaaccccccccccccihhmmmmmmmhggoooooooffffaaaccccc
+abcccccaaacaccccccccaaccccccccccccchhhhhhhhhhhggggggggggffaaacccccc
+abaccccaacccccccccccaaaccccccccccccchhhhhhhhhhgggggggggggcaaacccccc
+abaaaccccaccccccccccaaaacccaacccccccchhhhhhhaaaaaggggggcccccccccccc
+abaaaccccaaacaaaccccaaaacaaaacccccccccccccccaaaacccccccccccccccaaac
+abaacccccaaaaaaaccccaaaaaaaaacccccccccccccccaaacccccccccccccccccaaa
+abaaaccccaaaaaaccccaaaaaaaaccccccccccccccccccaacccccccccccccccccaaa
+abccccccaaaaaaaaaaaaaaaaaaacccccccccccccccccaaccccccccccccccccaaaaa
+abcccccaaaaaaaaaaaaaaaaaaaaacccccccccccccccccccccccccccccccccaaaaaa