maximum = None
minimum = None

while True:
    #enter the input
    inp = raw_input("Enter a number:")

    #handle the edge cases
    if inp == "done" :
        break
    if len(inp) < 1 :
    break

    #only accept good input
    try:
        num = int(inp)
        #print num
    except:
        print "Invalid input"
        continue

    #do the work
    if num > maximum :
        max = num
    if num < minimum :
        min = num
    else:
        num

print "Maximum is", max
print "Minimum is", min