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<list>
#include<vector>
#include<stack>
#include<queue>
using namespace std;
int main()
{
    int n,q;
    cin>>n>>q;
    queue<int> que[n];
    int tp1,tp2,a;
    while(q--){
        cin>>tp1;
        switch(tp1){
        case 0:
            cin>>tp2>>a;
            que[tp2].push(a);
            break;
        case 1:
            cin>>tp2;
            if(!que[tp2].empty())cout<<que[tp2].front()<<"\n";
            break;
        case 2:
            cin>>tp2;
            if(!que[tp2].empty())que[tp2].pop();
            break;
        }
    }
}

//list<int> lit;
//list<int>::iterator it;
//int main()
//{
//    lit.clear();
//    int t,tp,a;
//    it=lit.begin();
//    cin>>t;
//    while(t--){
//        cin>>tp;
//        switch(tp){
//        case 0:
//            cin>>a;
//            lit.insert(it,a);
//            break;
//    case 1:
//            cin>>a;
//            if(a<0){
//                while(a++){
//                    if(it!=lit.end())it++;
//                }
//            }
//            else if(a>0){
//                while(a--){
//                    if(it!=lit.begin())it--;
//                }
//            }
//        break;
//    case 2:
//        lit.erase(--it);
//        break;
//        }
//    }
//    lit.reverse();
//    for(it=lit.begin();it!=lit.end();it++){
//
//        cout<<*it<<"\n";
//    }
//}