c++4wa，谢谢

4wa，thank

#include<iostream>
#include<cstring>
using namespace std;
int main() {
    string str;
    int l;
    cin >>l>>str;
    for(int i = 0;i < str.length();i++)

        if(str[i]=='z'){
            str[i] ='a';
            str[i]+=l-1;
        } else{
            str[i] +=l;
        }
    cout << str;
    return 0;
}