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:
#pragma hdrstop
#pragma argsused

#include <iostream>
#include <queue>
#include <vector>

using namespace std;

int main()
{
	int n, q, query, x, t;
	cin >> n >> q;
	vector<queue<int> > Q(n);
    for (int i = 0; i < q; ++i)
	{
		cin >> query;
		switch (query)
        {
		case 0:
            cin >> t >> x;
			Q[t].push(x);
			break;
		case 1:
			cin >> t;
			if (!Q[t].empty()) //S[t]が空でなければ
			{
				cout << Q[t].front() << endl;
			}
			break;
		case 2:
			cin >> t;
			if (!Q[t].empty())
			{
				Q[t].pop();
			}
			break;
		}
	}
}