def push(self, x):
    '\n        :type x: int\n        :rtype: void\n        '
    self.stack1.append(x)
    if ((len(self.stack2) == 0) or (x <= self.stack2[(- 1)])):
        self.stack2.append(x)
:type x: int
:rtype: void
def push(self, x):
    '\n        :type x: int\n        :rtype: void\n        '
    self.stack1.append(x)
    if ((len(self.stack2) == 0) or (x <= self.stack2[(- 1)])):
        self.stack2.append(x)