def janken(_):
    """
    :return:
    >>> janken('gpgpgppppg')
    6
    >>> janken('ggggggggggggggg')
    0
    >>> janken('ccpcpppcccpppcppcpcc')
    10
    >>> janken('ggcgcgcggggcpgcggcgcggggcgcgcc')
    0
    """
    h = {}
    for _ in _:
        if h.get(_):
            h[_] += 1
        else:
            h[_] = 1
 
    if len(h) != 2: return 0
    if not h.get('c'): return h['p']
    if not h.get('g'): return h['c']
    if not h.get('p'): return h['g']
 
 
if __name__ == '__main__':
    import doctest
 
    doctest.testmod()

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