Numbers Addition - Left to Right

                    Numbers Addition - Left to Right 

Given two numbers N1 and N2, find the sum by adding them from left to right.

Input Format:
The first line contains N1.
 The second line contains N2.

Output Format:
The first line contains the sum of N1 and N2 added from left to right.

Boundary Conditions:
100 <= N1 <= 999999
100 <= N2 <= 999999

Example Input/Output 1:

Input:
6321
5235
Output:
1656

 Example Input/Output 2:
 Input:
16282
 5964
 Output:
11257

Code:

       
import java.util.*;

import java.math.*;


class sample

{

 public static void main(String[] args)

 {

  Scanner sc=new Scanner(System.in);

  String s1=sc.next();

  String s2=sc.next();

  char[] ch=s1.toCharArray();

  char[] ch1=s2.toCharArray();

  String str="",str1="";

  int i,n;

  for(i=ch.length-1;i>=0;i--)

   str+=ch[i];

  for(i=ch1.length-1;i>=0;i--)

   str1+=ch1[i];

  if(str.length()!=str1.length())

  {

   n=Math.abs(str.length()-str1.length());

   if(str.length()==str1.length()+n)

   {

    for(i=0;i<n;i++)

     str1+='0';

   }

   else //if(str1.length()==str.length()+n)

    for(i=0;i<n;i++)

     str+='0';

  }

  int a=Integer.parseInt(str);

  int b=Integer.parseInt(str1);

  String res=Integer.toString(a+b);

  for(i=res.length()-1;i>=0;i--)

  System.out.print(res.charAt(i));

 }

}