Name: Anonymous 2009-02-02 19:35
print 'MATH OS'
print
while 1:
print
print'[a]dd'
print'[s]ubtract'
print's[h]utdown'
print
inp = raw_input('?')[0]
if inp=='a':
print input('?')+input('?')
if inp=='s':
print input('?')-input('?')
if inp=='h':
break