import java.util.Scanner;
 
public class Main{
 
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int n = stdIn.nextInt(); //n個後の文字
		char[] s = stdIn.next().toCharArray(); //文字列S
		if(n==0) {
			System.out.println(s);
			System.exit(0);
		}
		
		
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < s.length; j++) {
				if(s[j] == 'Z') {
					s[j] ='A';
				}else {
				
					s[j]++;
				}
			
			}
		}	
		for(char a: s) {
			System.out.print(a);
		}
	}
 
}
/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