Backpacking

import fileinput

A, B = 0, 0

for line in fileinput.input():
    str_A, str_B = line.split()
    A = int(str_A)
    B = int(str_B)

print(A + B)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED