diff --git a/2016-python2/output/day_21.py b/2016-python2/output/day_21.py
new file mode 100644
index 0000000..d7eba1c
--- /dev/null
+++ b/2016-python2/output/day_21.py
@@ -0,0 +1,64 @@
+import re
+from itertools import permutations
+
+from output import ints
+
+
+def solve(data):
+    data = [line.strip() for line in data.splitlines()]
+    p1 = scramble(data, "abcdefgh")
+    p2 = unscramble(data, "fbgdceah")
+    return p1, p2
+
+
+def scramble(data, subject):
+    r_swap = r"(?:letter|position) (.)"
+    for line in data:
+        if line.startswith("rotate right"):
+            x = ints(line)[0]
+            subject = subject[-x:] + subject[:-x]
+        if line.startswith("rotate left"):
+            x = ints(line)[0]
+            subject = subject[x:] + subject[:x]
+        if line.startswith("rotate based"):
+            x = re.findall(r"letter (.)", line)[0]
+            i = subject.index(x)
+            j = i + 1 % len(subject)
+            subject = subject[-j:] + subject[:-j]
+            if i >= 4:
+                subject = subject[-1:] + subject[:-1]
+        if line.startswith("swap letter"):
+            x, y = re.findall(r_swap, line)
+            subject = subject.replace(y, "#")
+            subject = subject.replace(x, y)
+            subject = subject.replace("#", x)
+        if line.startswith("swap position"):
+            x, y = ints(line)
+            v1, v2 = subject[x], subject[y]
+            subject = subject[:x] + v2 + subject[x + 1 :]
+            subject = subject[:y] + v1 + subject[y + 1 :]
+        if line.startswith("move"):
+            x, y = ints(line)
+            v = subject[x]
+            subject = subject[:x] + subject[x + 1 :]
+            subject = subject[:y] + v + subject[y:]
+        if line.startswith("reverse"):
+            x, y = ints(line)
+            subject = subject[:x] + subject[x : y + 1][::-1] + subject[y + 1 :]
+    return subject
+
+
+def unscramble(data, T):
+    for candidate in ["".join(c) for c in permutations(T)]:
+        if scramble(data, candidate) == T:
+            return candidate
+
+
+if __name__ == "__main__":
+    with open("./input/21.txt", "r") as f:
+        inp = f.read().strip()
+
+    p1, p2 = solve(inp)
+
+    print(p1)
+    print(p2)