#include<bits/stdc++.h>
#define str string
#define ll long long
#define db double
#define pii pair<int, int>
#define piii pair<int, pii>
#define piiii pair<pii, pii>
#define se second
#define fi first
#define vi vector<int>
#define vii vector<vector<int>>
#define mpii map<int, int>
#define umpii unordered_map<int, int>
#define si set<int>
#define usa unordered_set<int>
#define mulsi multiset<int>
using namespace std;
 
const int mod=1e9+7;
const int maxn=1e5+1;
 
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, m; cin>>n>>m;
    return 0;
}

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