A - chukodai

https://atcoder.jp/contests/abc236/submissions/28720343

AtCoder/ABC236/A/A.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+#include <string>
+
+using std::cin;
+using std::cout;
+using std::endl;
+
+int main() {
+    std::string s;
+    int a, b;
+    cin >> s >> a >> b;
+    char c = s[a - 1];
+    s[a - 1] = s[b - 1];
+    s[b - 1] = c;
+    cout << s << endl;
+    return 0;
+}