题解 | #简单密码#

#include <bits/stdc++.h>
using namespace std;

bool isEngChar(char c) {
    if (c <= 'Z' && c >= 'A')return true;
    return false;
}

char change(char c) {
    if (isEngChar(c -5))return c -5;
    return c+21;
}

int main() {
    string s;
    while (getline(cin, s)) {
        if (s == "ENDOFINPUT")return 0;
        if (s == "START" || s == "END")continue;
        //开始处理输入
        string res;
        for (int i = 0; i < s.length(); i++) {
            if (isEngChar(s[i]))
                res.push_back(change(s[i]));
            else
                res.push_back(s[i]);
        }
        cout << res<<endl;
    }
}
// 64 位输出请用 printf("%lld")