#include <iostream>
using namespace std;
 
int main(void)
{   
    int n;
    cout<<"Unesite broj redova matrice --->";
    cin>>n;
     
    int m;
    cout<<"Unesite broj kolona matrice --->";
    cin>>m;
 
    int iMatrica[n][m];
     
    for(int i=0;i < n;i++)
    {
        for(int j=0;j < m;j++)
        {
            cout<<"iMatrica ["<<i<<","<<j<<"] ---> ";
            cin>>iMatrica[i][j];
        }
    }
    for(int i=0;i < n;i++)
    {
        for(int j=0; j < m;j++)
        {
            if((i>0)&&(i % 3 == 0))
            {
                cout<<iMatrica[i][j]<<" ";
            }
        }
    cout<<endl;
    }
     

    return 0;   
}