# 蒟蒻求助！第四个点始终过不去哇，一直WA,大佬们帮忙看看

#include<cstdio>
#include<cstring>
int main()
{
    char ch[100];
    int n;
    scanf("%d",&n);
    n = n%26;
    scanf("%s",ch);
    for(int i=0;i<strlen(ch);i++)
    {
        ch[i] = ch[i] +n;
        if(ch[i]>'z') ch[i] = ch[i] -26;
    }
    printf("%s",ch);
    return 0;
}