ModAdd

import fileinput
#import time

#t1 = time.time()

with fileinput.input(['-']) as input:
    a = input.readline().rstrip()
    b = input.readline().rstrip()
    len_a = len(a)
    len_b = len(b)
    res = []
    d = {}
    for i in range(19):
        d[i] = str(i % 10)
    z = min(len_a, len_b)
    for i in range(-1, -z-1, -1):
        a_i = int(a[i])
        b_i = int(b[i])
        res.append(d[a_i + b_i])
    res = res[::-1]
    if len_a > len_b:
        res = list(a[0:len_a - z]) + res
    elif len_a < len_b:
        res = list(b[0:len_b - z]) + res
    res = ''.join(res).lstrip('0')
    if not res:
        print('0')
    else:
        print(res)

#t2 = time.time()

#print(t2-t1)

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: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED