import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);		
		// shift By		
		int shiftBy = sc.nextInt();
		
		char[] input = sc.next().toCharArray();
		
		StringBuilder output = new StringBuilder();
		for (char c : input)
		{
			int findInt = c + shiftBy;
			if ( findInt > 90 )  findInt -= 26;
			char tchar = (char) (findInt);
			output.append(tchar);
		}
		
		sc.close();
		System.out.println(output.toString());
	}
}
/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