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[] c = s.toCharArray();
      	for(char c1 : c) {
      	    char c2 = c1;
      	    c2 += n;
      	    if (c2 > (char)'Z') {
      	        c2 -= 'Z';
      	        c2 --;
      	        c2 += 'A';
      	    }
      	    System.out.print(c2);
      	}
      	System.out.println("");
    }
}
/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