Betumix

import java.util.Scanner;

public class Progmasters {

    public static void main(String[] args) {

     Scanner scanner = new Scanner(System.in);
     String string1 = scanner.nextLine();
     String string2 = scanner.nextLine();

 if (string1.length()>string2.length()) {
    String newString = "";
    int i = 0;
    while (i<string2.length()){
        newString =string2.substring(i, i+1)+string1.substring(i, i+1);

        System.out.print(newString);
        i++;
    }
    System.out.print(string1.substring(i));
 }

 else {
    String newString = "";
    int i = 0;
    while (i<string1.length()){
        newString = string2.substring(i, i+1)+string1.substring(i, i+1);
        System.out.print(newString);
        i++;
    }
    System.out.print(string2.substring(i));
 }
     scanner.close();

}
}