import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        String dhanu = sc.nextLine();
        String sow = sc.nextLine();
        if (dhanu.length() != 1 || sow.length() != 1 ||!Character.isLetter(dhanu.charAt(0)) || !Character.isLetter(sow.charAt(0))) {System.out.println("Invalid input");
             return;
}

        char dhanush = dhanu.charAt(0);

        char sowm = sow.charAt(0);

        String result = "";

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

            char ch = s.charAt(i);

            if (ch == dhanu) {

                result += sowm;

            } else {

                result += ch;

            }

        }

        System.out.println(result);

    }

}