import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner scn = new Scanner(System.in);
   	int n = scn.nextInt();
    String s = scn.next();
    int asc ;
    char ch[] = new char[s.length()];
    
    for(int i=0; i<s.length();i++){
    	asc = (int)s.charAt(i) + n;
      	if(asc > 90) asc -=26;
      	ch[i] = (char)asc;
    }
     for(int i=0; i<s.length();i++){
    	System.out.print(ch[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