//wave print col wise
#include
using namespace std;
int main() {
int m,n,arr[10][10],i=0,j=0;
cin >> m >> n;
for(i=0;i<m;i++){
for(j=0;j<n;j++){
cin >> arr[i][j];
}
}
for(j=0;j<n;j++){
if(j%2==0){
for(i=0;i<m;i++){
cout << arr[i][j] << “,”;
}
}
else{
for(i=m-1;i>=0;i–){
cout << arr[i][j] << “,”;
}
}
}
cout << “END”;
return 0;
}
