3 - 5
8 * 7
565**

num_spaces = x.count(' ')
l1 = targil.split(' ')
if len(l1) != 3:
    # Error
else:
    # continue checking

f1 = open(sys.argv[1], 'r')

line1 = f1.readline()
while line1:
    # processing
    line1 = f1.readline()