from Stack import Stack

class RA_stack(Stack):
    def top_minus(self, offset):
        """Returns an element of self, at a specified offset from the top.
        arguments:
          self -- an RA_stack
          offset -- a nonnegative integer; 0 indicates the top element"""

        assert offset >= 0 and offset < len(self.contents)
        tempList = []
        position = 0
        while position < offset:
            tempList.append(self.top())
            self.pop()
            position += 1
        result = self.top()
        for e in tempList:
            self.push(e)
        return result

ra = RA_stack()
for e in range(10):
    ra.push(e)

for offset in range(5):
    print ra.top_minus(offset)