diff --git a/alpacahack/daily/cha-ll-enge/solve.py b/alpacahack/daily/cha-ll-enge/solve.py
new file mode 100644
--- /dev/null
+++ b/alpacahack/daily/cha-ll-enge/solve.py
@@ -0,0 +1,11 @@
+key = [
+    119, 20, 96, 6, 50, 80, 43, 28, 117, 22, 125, 34, 21, 116, 23, 124, 35, 18,
+    35, 85, 56, 103, 14, 96, 20, 39, 85, 56, 93, 57, 8, 60, 72, 45, 114, 0,
+    101, 21, 103, 84, 39, 66, 44, 27, 122, 77, 36, 20, 122, 7
+]
+flag = ""
+
+for i in range(len(key) - 1):
+    flag += chr(key[i] ^ key[i+1])
+
+print(flag)