import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        
        int n = Integer.parseInt(sc.next());
        
        String s = sc.next();
        
        char[] cs = s.toCharArray();
        for(int i = 0; i < cs.length; i++){
            cs[i] += n;
            if(cs[i]>90){
                cs[i]-=26;
            }
        }
        System.out.println(new String(cs));
    }
}
/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