diff --git a/2021/day10.py b/2021/day10.py
new file mode 100644
index 0000000..21beb2b
--- /dev/null
+++ b/2021/day10.py
@@ -0,0 +1,37 @@
+import sys
+
+
+CHARMAP = {"]": "[", ")": "(", "}": "{", ">": "<"}
+SCOREMAP = {")": 3, "]": 57, "}": 1197, ">": 25137}
+SCOREMAP2 = {"(": 1, "[": 2, "{": 3, "<": 4}
+
+
+def main():
+    lines = [line.rstrip() for line in sys.stdin]
+    error_score = 0
+    comp_scores = []
+    for line in lines:
+        corrupted = None
+        state = []
+        for char in line:
+            if char in CHARMAP:
+                if state and state[-1] == CHARMAP[char]:
+                    state.pop()
+                else:
+                    corrupted = char
+                    break
+            else:
+                state.append(char)
+        if corrupted:
+            error_score += SCOREMAP[corrupted]
+        else:
+            cs = 0
+            for char in reversed(state):
+                cs = cs * 5 + SCOREMAP2[char]
+            comp_scores.append(cs)
+    print(error_score)
+    print(list(sorted(comp_scores))[len(comp_scores) // 2])
+
+
+if __name__ == "__main__":
+    main()