import java.io.; import java.util.;

public class Schar {

public static void main(String[] args)
{
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */

    int tp,l,n;
    Scanner sc=new Scanner(System.in);
    l=sc.nextInt();
    String s=sc.next();
    n=sc.nextInt();
    char u[]=s.toCharArray();
    char []sn=new char[l];
    for(int i=0;i<l;i++)
    {
        if(u[i]<='z' & u[i]>='a')  
         {

            tp=(int)u[i]+n;
            for(int j=1;(tp>122 | tp<97);j++)
                 tp=tp-26;
            sn[i]=(char)tp;

         }
         else if(u[i]<='Z' & u[i]>='A')
          {

            tp=(int)u[i]+n;
            for(int j=1;(tp>90 | tp<65);j++)
                 tp=tp-26;
            sn[i]=(char)tp;
          }    
         else
            sn[i]=u[i];
    }
    String f=new String(sn);
    System.out.println(f);
}

}