diff --git a/python/boj_20365.py b/python/boj_20365.py
new file mode 100644
index 0000000..6b3e7f1
--- /dev/null
+++ b/python/boj_20365.py
@@ -0,0 +1,28 @@
+import sys
+
+input = sys.stdin.readline
+
+
+def solution(n, data):
+    colors = {"R": 0, "B": 0}
+    colors[data[0]] += 1
+
+    for i in range(1, n):
+        if data[i] != data[i-1]:
+            colors[data[i]] += 1
+
+    return min(colors["R"], colors["B"]) + 1
+
+
+def display_result(answer):
+    print(answer)
+
+
+def main():
+    n = int(input())
+    data = list(map(str, input().rstrip()))
+    answer = solution(n, data)
+    display_result(answer)
+
+
+main()