#include<bits/stdc++.h>
using namespace std;
string s;
long long len,num;
char change(char c)
{
	char c1=c+num;
	if(c1>'z')
		c1-=26;
	return c1;
}
int main()
{
	cin>>num;
	num%=26;
	cin>>s;
	len=s.size(); 
	//cout<<len<<endl;
	for(int i=0;i<len;i++)
	{
		s[i]=change(s[i]);
		//cout<<i<<" "<<s[i]<<endl; 
	}
	cout<<s;
	return 0;
}

已经到入门题都要求助的地步了（悲

找不出错，感觉像是什么底层的概念有问题（或是我又sb了