import java.util.Scanner;

public class Main {    
    public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
      	s.useDelimiter("\n");
      	int key = s.nextInt();
      	char[] planeChar = s.next().toCharArray();
      	
      	StringBuilder sb = new StringBuilder();
      	for (int i = 0; i < planeChar.length; i++) {
          int intCipher = (planeChar[i] + key);
          if (intCipher > 90) intCipher -= 26;
          sb.append((char)(intCipher));	
        }
        System.out.println(sb);
  }
}
/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