import java.util.*;
class Main
{
  public static void main(String args[])
  {
    Scanner sc=new Scanner(System.in);
    int n;
    String s;
    n=sc.nextInt();
    sc.nextLine();
    s=sc.nextLine();
    char a[]=s.toCharArray();
    for(int i=0;i<s.length();i++)
    {
      a[i]=(char)((((a[i]-'A')+n)%26)+65);
    }
    String s1=new String(a);
    System.out.println(s1);
  }
}
/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