import java.util.*;
class Main
{
  public static void main(String args[])
  {
    Scanner sc=new Scanner(System.in);
    int k;
    String s;
    k=sc.nextInt();
    sc.nextLine();
    s=sc.nextLine();
    char ar[]=s.toCharArray();
    for(int i=0;i<ar.length;i++)
    ar[i]=(char)((ar[i]-65+k)%26+65);
    s=new String(ar);
    System.out.println(ar);
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz