Code Signal: Intro=47/60

def isMAC48Address(inputString):
    MAC = inputString.split('-')
    HEX = ['1', '2', '3', '4','5','6','7','8','9','0','A','B','C','D','E','F']
    if len(MAC) != 6:
        return False
    for k in range(6):
        if len(MAC[k]) != 2:
            return False
    for i in range(6):
        for j in range(2):
            if MAC[i][j] in HEX:
                continue
            else:
                return False
    return True