while True:
    text = raw_input("Please enter a word: ")
    neg = text[::-1]

    if text == neg:
        print "This is a Palindrome"
    else:
        print "This is NOT a Palindrome"

    while True:
        repeat = raw_input("Do you want to restart? (y/n): ")
        if repeat in ('y', 'n'):
            break
        print "invalid input"
    if repeat == 'y':
        continue
    else:
        print "Goodbye"
        break