Bounded Queue Simulation

You are required to simulate operations on a bounded queue data structure. The queue has a maximum size \( M \) (denoted as max_size). Your program must support the following operations:

• enqueue X: Add an integer \( X \) to the end of the queue. If the queue is already full (i.e. its current size equals \( M \)), output "ERROR".
• dequeue: Remove the integer at the front of the queue. If the queue is empty, output "ERROR". Note that a successful dequeue does not produce any output.
• get_front: Output the integer at the front of the queue without removing it. If the queue is empty, output "ERROR".
• get_size: Output the current number of elements in the queue.
• is_empty: Output "true" if the queue is empty; otherwise, output "false".

The input begins with two integers, \( N \) and \( M \), representing the number of operations and the maximum allowed capacity of the queue respectively. The next \( N \) lines each contain one of the operations described above.

Note: Only operations that are supposed to produce outputs (i.e. error conditions or explicit output commands) will result in printed lines. For instance, a successful enqueue or dequeue does not produce any output.

inputFormat

The first line of input contains two integers \( N \) and \( M \) separated by a space, where \( N \) is the total number of operations and \( M \) is the maximum capacity of the queue. The following \( N \) lines each contain a command. The commands are one of the following formats:

• enqueue X where \( X \) is an integer.
• dequeue
• get_front
• get_size
• is_empty

outputFormat

For each operation that produces output, print the result on a separate line. The expected outputs are as follows:

• get_front: Prints the element at the front of the queue or "ERROR" if the queue is empty.
• get_size: Prints the current size of the queue.
• is_empty: Prints "true" if the queue is empty or "false" otherwise.
• enqueue and dequeue: Only print "ERROR" if the operation fails (i.e. enqueue when full or dequeue when empty).

## sample

10 5
enqueue 1
enqueue 2
get_front
get_size
dequeue
get_front
get_size
dequeue
dequeue
is_empty

1
2
2
1
ERROR
true

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