Problem: Queue is a container of elements that are inserted and deleted according to FIFO (First In First Out).

For $n$ queues $Q_i$ ($i = 0, 1, ..., n-1$), perform a sequence of the following operations.

* enqueue($t$, $x$): Insert an integer $x$ to $Q_t$.
* front($t$): Report the value which should be deleted next from $Q_t$. If $Q_t$ is empty, do nothing.
* dequeue($t$): Delete an element from $Q_t$. If $Q_t$ is empty, do nothing.



In the initial state, all queues are empty.

Constraints

* $1 \leq n \leq 1,000$
* $1 \leq q \leq 200,000$
* $-1,000,000,000 \leq x \leq 1,000,000,000$

Input

The input is given in the following format.


$n \; q$
$query_1$
$query_2$
:
$query_q$


Each query $query_i$ is given by


0 $t$ $x$


or


1 $t$


or


2 $t$


where the first digits 0, 1 and 2 represent enqueue, front and dequeue operations respectively.

Output

For each front operation, print an integer in a line.

Example

Input

3 9
0 0 1
0 0 2
0 0 3
0 2 4
0 2 5
1 0
1 2
2 0
1 0


Output

1
4
2

Solution (in CPP):

Solution:
#include <iostream>
#include <queue>
#include <vector>

using namespace std;

/*--------------------------------------------*/
/* 0 : enqueue                                */
/* 1 : front                                  */
/* 2 : dequeue                                */
/*--------------------------------------------*/

int main()
{
  int n, q;
  cin >> n >> q;

  std::vector< std::queue<int> > que(n);

  int order;
  int t, num;

  for(int i=0; i<q; ++i){
    cin >> order >> t;

    if(order == 0){
    cin >> num;
    que[t].push(num);
    }
    else if(order == 1 && !que[t].empty()){
      cout << que[t].front() << endl;
    }
    else if(order == 2 && !que[t].empty()){
      que[t].pop();
    }
  }

  return 0;
}