import java.util.*;
public class Abc{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        char a = sc.next().charAt(0);
        char b = sc.next().charAt(0);
        for(int i=0;i<s.length();i++){
            char k = s.charAt(i);
            if(k==a)
                System.out.print(b);
            else
                System.out.print(k);
        }
        sc.close();
        if(s != sc.hasnext())
            System.out.println("Invalid input");
    }
}