#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	string s;
	cin>>n>>s;
	
	for(int i=0;i<s.length();i++)
	{
		s[i]=s[i]+n;
		if(s[i]>'z')
		{
			s[i]='a'+s[i]%'z'-1;
		}
	}
	cout<<s;
	
	return 0;
}

in 26 qwertyuiopasdfghjklzxcvbnm
out qwertyuiopasdfghjklzxcvbnm 我的输出 嫅e寧搹儔奱峝€亗剠啍抍恇垏 明明大于z的时候循环到a开始了