import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    String s = sc.next();
    char[] c1 = s.toCharArray();
    for(int i = 0; i < s.length(); i++) {
      int r = c1[i] - 'A';
      r = (r + n) % 26;
      c1[i] = (char)('A' + r);
    }
    System.out.println(new String(c1));
  }
}
/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