ls=[int(i) for i in input().split(",")]
print(max(ls))
#!/usr/bin/env python
#-*- coding:utf-8 -*-
data = input("请输入用逗号隔开的一串数字：")
res = list(map( lambda x:int(x),data.split(',') ))
print(max(res))
a = list(input("请输入一串数字(逗号隔开)："))
print(max(a))如有帮助，请采纳！