using System;

class MainClass
{
  public static void Main(string[] args)
   {
    Console.WriteLine("輸入一個1至9的正整數");
        int q = Int32.Parse(Console.ReadLine());
        Console.WriteLine("輸入一串英文字母");
        string w = Console.ReadLine();
        Console.WriteLine(ASC(q,w));
    }
         public static string ASC(int q, string w)
         {
           string k="";
            for(int i=0;i<w.Length;i++)
            {
              int ascii =  Convert.ToInt32(w[i]);
              if(ascii>=65 && ascii<=90)
              {
                ascii=ascii+q;
                if(ascii>90)
                {
                  ascii=ascii-25;
                }
                char ch = Convert.ToChar(ascii);
                string ch1=ch.ToString();
                k=k+ch1;
              }
              if(ascii>=97 && ascii<=122)
              {
                ascii=ascii+q;
                if(ascii>122){
                  ascii=ascii-25;
                }
                char ch = Convert.ToChar(ascii);
                string ch1=ch.ToString();
                k=k+ch1;
              }
            }
            return k;
         }


}