package z_finalDemoExam;

import java.util.Scanner;

public class Deciphering {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        String line = console.nextLine();
        String[] substringChars = console.nextLine().split("\\s+");
        String toReplace = substringChars[0];
        String replacement = substringChars[1];

        StringBuilder result = new StringBuilder();
        for (int i = 0; i < line.length(); i++) {
            char charInLine = line.charAt(i);
            if (!isValid(charInLine)){
                System.out.println("This is not the book you are looking for.");
                return;
            }
           result.append((char) (charInLine - 3));
        }

        for (int i = 0; i < result.length(); i++) {

        }

        String setaa = result.toString();
        setaa = setaa.replaceAll(toReplace,replacement);

        System.out.println(setaa);

    }


    private static boolean isValid(char letter){
        boolean result = true;
        if (letter < 'd'){
            result = false;
        }

        if (letter == '#' || letter == ',' || letter == '|'){
            result = true;
        }

        return result;
    }
}