SENTINEL = -1

def sentinel_ex():

    # get first value

    value = int( raw_input("type in first value or " + str(SENTINEL)
                           + " to quit: "))

    while (value != SENTINEL):

        print "hey! " + str(value) + " is REAL DATA!!!"

        value = int (raw_input("type in next value or " + str(SENTINEL)
                           + " to quit: "))

    # finish up

    print "DONE!!"