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$(\text{'}$A$\text{'})$

$>>>$ s$.$push$(\text{'}$B$\text{'})$

$>>>$ s$.$push$(\text{'}$C$\text{'})$

$>>>$ s$.$peek$()$

$>>>$ s$.$pop$()$

$>>>$ s$.$push$(\text{'}$D$\text{'})$

$>>>$ s$.$pop$()$

$>>>$ s$.$pop$()$

$>>>$ s$.$peek$()$

$>>>$ s$.$pop$()$