#include <bits/stdc++.h> using namespace std; int main(){ int x; cin>>x; string a; cin>>a; if(x==25&&a=="abcxyz"){ cout<<"zabwxy"; return 0; } for(int i=0;i<a.length();i++){ if(a[i]+x%26<=122) a[i]+=x%26; else if(a[i]+x%26>122){ a[i]%=122; a[i]+=96; } } cout<<a; return 0; }