def __init__(self):
    '\n\t\tAttributes:\n\t\t\tdata (arr): data stored in the stack\n\t\t\tminimum (arr): minimum values of data stored\n\t\t'
    self.data = []
    self.minimum = []
Attributes:
        data (arr): data stored in the stack
        minimum (arr): minimum values of data stored
def __init__(self):
    '\n\t\tAttributes:\n\t\t\tdata (arr): data stored in the stack\n\t\t\tminimum (arr): minimum values of data stored\n\t\t'
    self.data = []
    self.minimum = []