CombineLists

import java.util.Arrays;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
	// write your code here

    Scanner sc = new Scanner(System.in);
    String line1 = sc.nextLine();
    String line2 = sc.nextLine();
    String[] input1 = line1.split(",");
    String[] input2 = line2.split(",");
        String result = new String();
        for (int i = 0; i < input1.length; i++) {
            result = result + input1[i] + input2[i];

        }



        System.out.println(String.join(",",result));

    }

}