Bug, asserts are passed but result is fail

I would like to give some feedback about ...

From: http://www.checkio.org/mission/three-words/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36

My Code:

def checkio(words):
    print ('*' * 50)
    l = words.split()
    count = 0
    for i in l:
        if not i.isdigit():

            count += 1
            #print (count)
        else:
            count = 0
    #print (count)

    if count >= 3:
        print (words, 'TRUE')
        return True
    else:
        print (words, 'FALSE')
        return False


#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
    assert checkio("Hello World hello") == True, "Hello"
    assert checkio("He is 123 man") == False, "123 man"
    assert checkio("1 2 3 4") == False, "Digits"
    assert checkio("bla bla bla bla") == True, "Bla Bla"
    assert checkio("Hi") == False, "Hi"