python/TangDou/KaoShi/大小写转换.cpp

#include <bits/stdc++.h>

using namespace std;

int main() {
    string s;
    cin >> s;
    for (int i = s.size() - 1; i >= 0; i--)
        if (s[i] >= 'A' && s[i] <= 'Z')
            cout << s[i] + 32;
        else
            cout << s[i];
    return 0;
}