import java.util.*;
import java.math.*;
 
class Main
{
	public static void main (String[] args)
	{
		Scanner in = new Scanner(System.in);
		in.useDelimiter(""); //Чтение по одному символу.
 
		int a = (int)in.next().charAt(0); //Первый ключ
		int c = (int)in.next().charAt(0); //Пробел
		int b = (int)in.next().charAt(0); //Второй ключ
		c = (int)in.next().charAt(0);     //Пробел
 
		while(in.hasNext()){
			c = (int)in.next().charAt(0);
			System.out.print((char)((c*a+b)%256));
			System.out.print((char)((c*a+b)/256));
		}
	}
}

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