Q21

Consider the following sequence of operations on an empty stack.

$$\textsf{push}(54);\textsf{push}(52);\textsf{pop}();\textsf{push}(55);\textsf{push}(62);\textsf{s}=\textsf{pop}();$$

Consider the following sequence of operations on an empty queue.

$$\textsf{enqueue}(21);\textsf{enqueue}(24);\textsf{dequeue}();\textsf{enqueue}(28);\textsf{enqueue}(32);\textsf{q}=\textsf{dequeue}();$$

The value of $\textsf{s+q}$ is ___________.