Bigger.java

import java.util.Scanner;

public class Bigger {
    String a;
    String b;
    Bigger(){
        Scanner s = new Scanner(System.in);
        a= s.next();
        b=s.next();
    }

    public static void main(String[] args) {
        Bigger obj = new Bigger();
        int ls1 = obj.a.length();
        int ls2 = obj.b.length();
        String s="";
       if(ls1<=ls2){
           for(int j=0;j<ls1;j++){
               s+= Character.toString(obj.a.charAt(j));
               s+= Character.toString(obj.b.charAt(j));
           }
           for(int i=ls1;i<ls2;i++ ){
               s+= Character.toString(obj.b.charAt(i));
           }
       }
       else {
           for(int j=0;j<ls2;j++){
               s+= Character.toString(obj.a.charAt(j));
               s+= Character.toString(obj.b.charAt(j));
           }
           for(int i=ls2;i<ls1;i++ ){
               s+= Character.toString(obj.a.charAt(i));
           }
       }
        System.out.println(s);
    }
}