# CalStatistics.py
def getNum():
    ls = []
    data = input("请输入数据（回车结束）：")
    while data != '':
        ls.append(eval(data))
        data = input("请输入数据（回车结束）：")
    return ls


def getMean(ls):
    sum = 0
    for i in ls:
        sum += i
    return sum / len(ls)


def getMedian(ls):
    sorted(ls)
    lsLen = len(ls)
    if lsLen % 2 == 0:
        return (ls[lsLen//2 - 1] + ls[lsLen//2]) / 2
    else:
        return ls[lsLen//2]


def main():
    ls = getNum()
    mean = getMean(ls)
    median = getMedian(ls)
    print("平均数：{:.2f}, 中位数：{:.2f}".format(mean, median))


main()