题解

#include<bits/stdc++.h>
using namespace std;
char s[100086];
long long a=0,b;
int main()
{
cin>>a;
cin>>s;
int n = strlen(s);
for(int i=0;i<n;i++){
b=(s[i]-'a'+a)%26;
s[i]='a'+b;
}
cout<<s;
return 0;
}