Chapter6_Func_Ex2

import java.util.Scanner;
/*
    =====================================================
                   chapter 6: Functions

      Ex2:
    =====================================================
*/

public class MyProgram {

    public static int createNumber(int a,int b){
        String result="";
        while(a>0 && b>0){
            result= String.valueOf((a%10<b%10) ? a%10: b%10)+result;
            a/=10;
            b/=10;
            if ((a==0 && b!=0) ||(a!=0 && b==0)){
                return -1;
            }
        }
        return Integer.parseInt(result);
    }
    public static void main(String[] args) {
        int a,b;
        int res;
        Scanner s=new Scanner(System.in);
        System.out.println("Enter 2 numbers: ");
        a=s.nextInt();
        b=s.nextInt();
        res=createNumber(a,b);
        System.out.println(res);

    }
}