#include <iostream>
int main(){
int n, m;
std :: cin >> n >> m;
int array[109][109];
for (int i = 0; i<n; ++i){
for (int j = 0; j<m; ++j)
{
if (i==0 || i%2==0) std :: cin >> array[i+1][j];
else std :: cin >> array[i-1][j];
}
}
for (int i=0; i<n; ++i){
for (int j= 0; j<m; ++j)
{
std :: cout << array[i][j]<< ' ';
}
std :: cout << std :: endl;
}
}