none = 1
while none:
    a = input("请输入奇数个整数(用逗号分开):")
    alist = a.split(",")
    print(alist)
    alist = [int(alist[i]) for i in range(len(alist))]

    if int(len(alist)) % 2 == 1:  # 检测是否为整数
        none = 0
    else:
        continue
alist.sort()
print("a=%s" % alist[int(len(alist)/2)])