# -*- coding:utf-8 -*-
class Solution:
def __init__(self):
self.list1=[]
def push(self, node):
# write code here
self.list1.append(node)
def pop(self):
# write code here
self.list1.pop()
def top(self):
# write code here
return self.list1[len(self.list1)-1]
def min(self):
# write code here
return min(self.list1)


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