#include
using namespace std;
int main() {
int n;
int m;
cin>>n>>m;
int a[10][10];
for (int i=0;i<n;i++)
{
for (int j=0;j<m;j++)
{
cin>>a[i][j];
}
}
for (int i=0;i<m;i++)
{
if (i%2==0)
{
for (int row=0;row<n;row++)
{
cout<<a[row][i]<<" ";
}
}
else
{
for (int row=n-1;row>=0;row--)
{
cout<<a[row][i]<<" ";
}
}
}
return 0;
}
