Consider a sequence a of elements a0 = 1, a1 = 5, a2 = 7, a3 = 8, a4 = 9, and…

Consider a sequence a of elements a0 = 1, a1 = 5, a2 = 7, a3 = 8, a4 = 9, and a5 = 2. The following operations are performed on a stack S and a queue Q, both of which are initially empty.

    I: push the elements of a from a0 to a5 in that order into S.

    II: enqueue the elements of a from a0 to a5 in that order into Q.

    III: pop an element from S.

    IV: dequeue an element from Q.

    V: pop an element from S.

    VI: dequeue an element from Q.

    VII: dequeue an element from Q and push the same element into S.

    VIII: Repeat operation VII three times.

    IX: pop an element from S.

    X: pop an element from S.

The top element of S after executing the above operations is .