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What is the output when the following sequence of operations is performed on an empty stack s ? Enter your answer as a comma -

What is the output when the following sequence of operations is performed on an empty stack s? Enter your answer as a comma-
and space separated list, e.g. A, A, A, A, A if you think the answer is 5 As in a row.
>>s.push('A')
>>s.push(B'')
>>s.push('C')
>>s. peek ()
>>>s.pop()
>>s.push('D')
>>s.pop()
>>s.pop()
>>s. peek ()
>>>s.pop()
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