import java.util.*;
import java.io.*;

class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.nextLine();
		String s = sc.nextLine();
		//sc.nextLine();
		
		int l = s.length();
		char[] str = new char[l];
		for(int i = 0; i < l; i++){
			int a = s.charAt(i) + n;
			if(a > 90){
				str[i] = (char)(s.charAt(i) + n - 26);
			}else{
			str[i] = (char)(s.charAt(i) + n);
			}
		}
		for(int i = 0; i < l; i++){
			System.out.print(str[i]);
		}
	}
		
		
}
/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