#include<bits/stdc++.h>
using namespace std;
int main(){
	string a,b;
	int c[60],n;
	scanf("%d",&n);
	cin>>a;
	for(int i=0;i<a.length();i++){
		c[i]=a[i]-'`';
		c[i]=c[i]+n%26;
		if(c[i]>26)	c[i]=c[i]%26;
			//printf("%d\n",c[i]);
		b[i]=c[i]+'a'-1;
		printf("%c",b[i]);
	}
	}
    ```