#include
using namespace std;
int main()
{
int M;
cin>>M;
int N;
cin>>N;
int arr[M][N];
for(int i=0;i<M;i++){
for(int j=0;j<N;j++){
cin>>arr[i][j];
}
cout<<endl;
}
int row_start=0;
int row_end=M-1;
int col_start=0;
int col_end=N-1;
while(col_start<=col_end){
// for printing first column in order
for(int row=row_start;row<=row_end;row++){
cout<<arr[row][col_start]<<","<<" ";
}
col_start++;
// for printing first column in reverse order
for(int row=row_end;row>=row_start;row--){
cout<<arr[row][col_start]<<","<<" ";
}
col_start++;
}
cout<<“END”;
}