deciphering

import java.util.Scanner;

public class deciphering {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        String input = scan.nextLine();
        String[] input2 = scan.nextLine().split("\\s+");

        String output = "";

        if (input.charAt(0) < 100 && !input.contains("{}#\\|")) {
            System.out.println("This is not the book you are looking for.");
            return;
        }

        for (int i = 0; i < input.length(); i++) {
            char x = (char) (input.charAt(i) - 3);
            output += x;
        }

        while (output.contains(input2[0])) {
            output = output.replace(input2[0], input2[1]);
        }
        System.out.println(output);
    }
}