#include <bits/stdc++.h>
using namespace std;
int n,m,nod1,nod2;
int mat[105][105];

int main()
{
    cin>>n>>m;
    for (int i = 1; i <= m; ++i)
    {
        cin>>nod1>>nod2;
        mat[nod1][nod2] = 1;
        mat[nod2][nod1] = 1;
    }
    for(int i = 1; i<=n; i++)
        for(int j = 1; j<=n; j++)
            for(int k = 1; k<=n; k++){
                if(i == k || j == k || i == j)
                    continue;
                if(mat[i][j] && mat[j][k] && mat[k][i])
                    cout<<i<<" "<<j<<" "<<k<<"\n";
            }

    return 0;
}