def extract_arguments(fh):
    inputs = []
    while True:
        line = fh.readline().strip()
        if line == "0 0 0 0":
            break
        a, m, b, n = map(int, line.split())
        inputs.append((a, m, b, n))
    return inputs

# if __name__ == "__main__":
#     input_path = sys.argv[1]
#     with open(input_path, 'r') as fh: 
#         inputs = extract_arguments(fh)
#         for inp in inputs:
#             f(*inp)