# Python3

# 有限制修改區域
def startupName(companies):
    cmp1 = set(companies[0])
    cmp2 = set(companies[1])
    cmp3 = set(companies[2])
    res = ((cmp1 & cmp2) | (cmp2 & cmp3) | (cmp3 & cmp1)) - (cmp1 & cmp2 & cmp3)
    return list(sorted(list(res)))

9f55b52724320b79bb0b293352721c8996953db3
<mask token>

def startupName(companies):
    cmp1 = set(companies[0])
    cmp2 = set(companies[1])
    cmp3 = set(companies[2])
    res = (cmp1 & cmp2 | cmp2 & cmp3 | cmp3 & cmp1) - (cmp1 & cmp2 & cmp3)
    return list(sorted(list(res)))

# Python3

# 有限制修改區域
def startupName(companies):
    cmp1 = set(companies[0])
    cmp2 = set(companies[1])
    cmp3 = set(companies[2])
    res = ((cmp1 & cmp2) | (cmp2 & cmp3) | (cmp3 & cmp1)) - (cmp1 & cmp2 & cmp3)
    return list(sorted(list(res)))
