//Answer in java import java.io.; import java.math.; import java.security.; import java.text.; import java.util.; import java.util.concurrent.; import java.util.regex.*;

public class cipher {

private static final Scanner scanner = new Scanner(System.in);

public static void main(String[] args) {
    int n = scanner.nextInt();
    scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

    String s = scanner.nextLine();

    int k = scanner.nextInt();
    scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

    scanner.close();
    for(int i=0;i<s.length();i++)
    {
        int ch=s.charAt(i);
        if(ch>=97&&ch<=122)
        {
            ch+=k;
            if(ch<=122)
            {
                System.out.print((char)ch);
            }
            else{
                while(ch>122)
                {
                ch=ch-122;
                ch=96+ch;
                }
                System.out.print((char)ch);
            }
        }
        else if(ch>=65&&ch<=90)
        {
            ch+=k;
            if(ch<=90)
            {
                System.out.print((char)ch);
            }
            else{
                while(ch>90)
                {
                ch=ch-90;
                ch=64+ch;
                }
                System.out.print((char)ch);
            }
        }
        else{
            System.out.print((char)ch);
        }
    }
}

}