import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

public class Main {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        String line = scanner.nextLine();
        String[] array1 = line.split(",");
        String line2 = scanner.nextLine();
        String[] array2 = line2.split(",");
        String[] newString = new String[array1.length + array2.length];
        for (int j = 0, a = 0; j < newString.length; j = j + 2, a++ ){
            newString[j] = array1[a];
        }
        for (int b = 1, c=0; b < newString.length; b = b + 2,c++) {
            newString[b] = array2[c];
        }
        System.out.println(String.join(",", newString));

    }


}