diff --git a/10/10_2.py b/10/10_2.py
new file mode 100755
index 0000000..d29d1fa
--- /dev/null
+++ b/10/10_2.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+# 2021 - Advent Of Code - 10 part 2
+
+def parse_file(file):
+    non_corrupted = []
+    with open(file) as f:
+        i = 0
+        for line in f.readlines():
+            chunks = []
+            corrupted = False
+            for c in line.strip():
+                if c in close_sign.values():  # open signs
+                    chunks.append(c)
+                elif c in close_sign:
+                    last_open = chunks.pop()
+                    if close_sign[c] != last_open:
+                        # print(f'found corrupted chunk at line {i}: {line.strip()}')
+                        count_score[c] += 1
+                        corrupted = True
+                        break
+            if not corrupted:
+                non_corrupted.append(line.strip())
+            i += 1
+        print(f'nb lines: {i}')
+
+    return non_corrupted
+
+
+def complete_lines(lines):
+    completions = []
+    for line in lines:
+        chunks = []
+        for c in line:
+            if c in close_sign.values():  # open signs
+                chunks.append(c)
+            elif c in close_sign.keys():
+                chunks.pop()
+        completion = [open_sign[c] for c in reversed(chunks)]
+        completions.append(completion)
+    return completions
+
+
+close_sign = {')': '(', ']': '[', '}': '{', '>': '<'}
+open_sign = {'(': ')', '[': ']', '{': '}', '<': '>'}
+count_score = {')': 0, ']': 0, '}': 0, '>': 0}
+score_table = {')': 1, ']': 2, '}': 3, '>': 4}
+
+# sequences = parse_file('input_example.txt')
+sequences = parse_file('input.txt')
+print(f'nb clean lines: {len(sequences)}')
+
+autocompletions = complete_lines(sequences)
+
+auto_score = []
+for a in autocompletions:
+    score = 0
+    for sign in a:
+        score = score * 5 + score_table[sign]
+    auto_score.append(score)
+
+score = sorted(auto_score)[int(len(auto_score)/2)]
+print(f'middle score: {score}')