import java.util.Scanner;

public class ReplaceCharacter {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        if(n<=0)
        {
            System.out.print("Invalid input");
        }

        
        String input = sc.nextLine().trim();
        char toReplace = sc.next().charAt(0);
        char replacement = sc.next().charAt(0);

        
        String result = input.replace(toReplace, replacement);

        
        System.out.println(result);

        
    }
}