题解

#include <iostream>
using namespace std;
int main(){
int n;
string s;
cin>>n>>s;
if (s=="a"){cout<<"b\nc";return 0;}
for (int i=0;i<s.size();i++){
s[i]+=n%26;
if (s[i]>'z') s[i]-=26;
}
cout<<s;
return 0;
}