Manipulate a queue according to the given insert and remove

commands and then output the number that is at the front of the

queue. If a remove command is issued for an empty queue then

nothing should happen. In your answer you should provide the

full queue class.

Input Format

A series of lines involving either INSERT or REMOVE

commands. The command INSERT is followed by a space and

then a number to insert $($e$.$g$.$ INSERT $56).$

Output Format

Output the number that is at the front of the queue following the

given commands. If the queue is empty then output $0.$

Sample Input

INSERT $56$

INSERT $33$

REMOVE

INSERT $83$

REMOVE

Sample Output