import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();
		String A = sc.next();
		char c = ' ';

		for(int i=0;i<A.length();i++) {
			c = A.charAt(i);
			for(int k=0;k<N;k++) {
				if(c=='Z'){
					c='A';
					--c;
				}
				++c;
			}

			System.out.print(c);
		}


	}

}

/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