Backpacking

#!/usr/bin/env python3

'''Backpacking'''

import sys

def backpacking(a, b):
    '''Backpacking challenge'''
    if a < 0:
        print('Error, A negative')
        return False
    if b > 10**6:
        print('Error, B too big')
        return False
    print(a + b)


def main():
    '''main'''
    a,b = [int(x) for x in input().split()]
    backpacking(a, b)

main()

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED