def hNvalidation(sentence):
    flag = 1

    Length = len(sentence)
    if Length > 4:
        for i in range(Length):
            if i+4 < Length:
                if sentence[i] == ' ' and sentence[i + 1] == 'h' and sentence[i + 2] == ' ' and sentence[i + 3] == 'N' and sentence[i + 4] == ' ':
                    flag = 0

    return flag
