P1914 小书童——密码

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    scanf("%d", &n);
    string str;
    cin >> str;
    n %= 26;
    while (n--)
        for (int i = 0; i < str.size(); i++)
            if (str[i] == 122)
                str[i] = 97;
            else
                str[i] += 1;
    printf("%s\n", str.c_str());
    return 0;
}