import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String kekka = "";
        int n=sc.nextInt();
        String s=sc.next();
		char[] c = s.toCharArray();
      	
      	int len = s.length();
      	for(int i=0;i<len;i++){
        	if((int)c[i]+n>90){
            	kekka = kekka + Character.toString((char)((int)c[i]+n-26));
            }else{
            	kekka = kekka + Character.toString((char)((int)c[i]+n));
            }
        }
		System.out.println(kekka);      	
	}
}
/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