import random

good = 0
total = 0
while True:
    n1 = random.randrange(-50, 50)
    n2 = random.randrange(-50, 50)
    print "What is", n1, "+", n2, "? ",
    answer = raw_input("Type: ")
    if answer == 'quit':
        print 'Okay, bye now.'
        break
    if answer == 'hard':
        print "Okay, we will skip this one."
        continue
    answer = int(answer)
    total = total + 1
    if answer == n1 + n2:
        print "Very good."
        good = good + 1
    else:
        print "Nope."
    print "So far", good, "out of", total