def equilateral(sides):
    for side in sides:
        if side == 0:
            return False
    return (sides[0] == sides[1]) and (sides[0] == sides[2]) and (sides[1] == sides[2])


def isosceles(sides):
    for side in sides:
        if side == 0:
            return False
    if (
        (sides[0] + sides[1] < sides[2])
        or (sides[1] + sides[2] < sides[0])
        or (sides[2] + sides[0] < sides[1])
    ):
        return False
    return (sides[0] == sides[1]) or (sides[0] == sides[2]) or (sides[1] == sides[2])


def scalene(sides):
    for side in sides:
        if side == 0:
            return False
    if (
        (sides[0] + sides[1] < sides[2])
        or (sides[1] + sides[2] < sides[0])
        or (sides[2] + sides[0] < sides[1])
    ):
        return False
    return (sides[0] != sides[1]) and (sides[0] != sides[2]) and (sides[1] != sides[2])