import java.util.Scanner;
public class Main
{
    public static void main(String[]args)
    {
        Scanner laptm = new Scanner(System.in);
        int n = laptm.nextInt();
        String s = laptm.next();
        char[] arreglochar = s.toCharArray();
        for(int i=0;i<arreglochar.length;i++)
        {
           if(arreglochar[i]+n>90)
           {
               arreglochar[i]=(char)(arreglochar[i]-26+n);
           }
           else
           arreglochar[i]+=n;
           }
        for(int i=0; i<arreglochar.length;i++)
        System.out.print(arreglochar[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