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def verificaGanhador(m):
    ganhou = ""

    #verificando horizontais:
    if m[0][0] != "_" and m[0][0] == m[0][1] and m[0][1] == m[0][2]:
        ganhou = m[0][0]
    elif m[1][0] != "_" and m[1][0] == m[1][1] and m[1][1] == m[1][2]:
        ganhou = m[1][0]
    elif m[2][0] != "_" and m[2][0] == m[2][1] and m[2][1] == m[2][2]:
        ganhou = m[2][0]
    #verificando verticais:
    elif m[0][0] != "_" and m[0][0] == m[1][0] and m[1][0] == m[2][0]:
        ganhou = m[0][0]
    elif m[0][1] != "_" and m[0][1] == m[1][1] and m[1][1] == m[2][1]:
        ganhou = m[0][1]
    elif m[0][2] != "_" and m[0][2] == m[1][2] and m[1][2] == m[2][2]:
        ganhou = m[0][2]
    #verificando diagonal principal:
    elif m[0][0] != "_" and m[0][0] == m[1][1] and m[1][1] == m[2][2]:
        ganhou = m[0][0]
    #verificando diagonal secundaria:
    elif m[2][0] != "_" and m[2][0] == m[1][1] and m[1][1] == m[0][2]:
        ganhou = m[2][0]

    return ganhou