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 PYTHON3):

Solution:
import collections


class TwoDimQueue():
    def __init__(self, num_queues):
        self.queues = [collections.deque() for i in range(0, num_queues, 1)]

    def enqueue(self, t, x):
        self.queues[t].appendleft(x)
        return self

    def front(self, t):
        if len(self.queues[t]) > 0:
            print(f'{self.queues[t][len(self.queues[t])-1]}')
        return self

    def dequeue(self, t):
        if len(self.queues[t]) > 0:
            self.queues[t].pop()
        return self


num_queues, q = tuple(map(int, input().split(' ')))
stacks = TwoDimQueue(num_queues)

for i in range(0, q):
    queue = tuple(map(int, input().split(' ')))
    if queue[0] == 0:
        stacks.enqueue(queue[1], queue[2])
    elif queue[0] == 1:
        stacks.front(queue[1])
    elif queue[0] == 2:
        stacks.dequeue(queue[1])