Verified answer

import sys

def main():

   with open('input.txt', 'r') as f:

       a, b = f.read().split()

       a = int(a)

       b = int(b)

       c = a + b

   with open('output.txt', 'w') as f:

       f.write(str(c))

if __name__ == '__main__':

   main()