diff --git a/24.7.py b/24.7.py
index 77c56a5..9f49bb1 100644
--- a/24.7.py
+++ b/24.7.py
@@ -15,4 +15,16 @@
 # matches = re.findall(pattern, data)
 #
 # res = max([len(match[0] + match[1])
-#            for match in matches])
\ No newline at end of file
+#            for match in matches])
+
+
+s = open('24_7.txt').readline().strip()
+pos = [-1]
+for p in range(len(s) - 1):
+    if s[p]+s[p+1] == 'CD':
+        pos.append(p)
+pos.append(len(s) - 1)
+ml = 0
+for p, p1 in zip(pos, pos[161:]):
+    ml = max(ml, p1 - p)
+print(ml)
\ No newline at end of file