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 sys
from collections import deque
n, q = map(int, input().split())

queues = {str(i): deque() for i in range(n)}

lines = sys.stdin.readlines()
for i in range(q):
    query, *arg = lines[i].split()
    if query == '0':    # enqueue t x
        queues[arg[0]].append(arg[1])
    elif query == '1':  # front
        if len(queues[arg[0]]):
            print(queues[arg[0]][0])
    elif query == '2':  # dequeue
        if len(queues[arg[0]]):
            queues[arg[0]].popleft()
    else:
        raise AssertionError