求助巨佬，第三个点WA，不知道哪错

#include <bits/stdc++.h>
using namespace std;
int main(){
    string s;
    int n;
    cin>>n;
    cin>>s;
    for(int i=0;i<s.size();i++){
        if(s[i]+n<=122){
            s[i] = s[i]+n;
        }
        else{
            s[i] = 96+(s[i]+n-122)%26;
        }
    }
    cout<<s<<endl;
    return 0;
}