Suppose the letter A is pushed onto an empty stack, followed by the letters B C D and E in that order. Now suppose a letter is popped off the stack and letters F G and H are pushed on the stack in that order. Assume a letter is popped off the stack and letter X is pushed on the stack Required:
a. List the letters that would be on the stack in the order they would appear from top to the bottom of the stack.
b. If a letter is popped off the stack which letter would it be?