Charles1 @ 2017-02-28 20:43:32
#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int main() {
char b[1000];
int n;
scanf("%d\n%c",&n,b);
for(int i=0; b[i]; ++i)
b[i]=((b[i]-'a'+n)%26)+'a';
printf("%s",b);
return 0;
}