ModAdd

# -*- coding: utf-8 -*-
"""
Created on Sat Sep 22 12:55:27 2018

@author: kiyakf1
"""

from itertools import izip_longest



def solve(n1,n2):
    
    #result = []
    
    it = izip_longest(map(int,iter(n1[::-1])),map(int,iter(n2[::-1])),fillvalue = 0)
    

    #for i in it:
    #    tot = int(i[0])+int(i[1])
    #    result.append(tot if tot<10 else tot-10)
    
    
    
    result = [a+b if a+b<10 else a+b-10 for (a,b) in it]    
    

    res=""
    for n in reversed(result):
        res+=str(n)
    
    return res
    
print(solve(raw_input(),raw_input()))

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED