#include <iostream>

using namespace std;

int main()
{
	int n , m;
	cout << "n=";
	cin >> n;
	cout << "m=";
	cin >> m;
	int *b = new int[m];
	for (int i = 0; i < m; ++i)

	{
		b[i] = 0;

	}

	int **a = new int *[n];
	for (int i = 0; i < n; ++i)

	{
		for (int j = 0; j < n; ++j)

		{
			a[i] = new int[n];
		}

	}

	for (int i = 0; i < n; ++i)

	{
		for (int j = 0; j < n; ++j)

		{
			cin >> a[i][j];

		}


	}

	for (int  j= 0; j < n; ++j)

	{  for (int i = 0; i < n; ++i)

		{
			if (a[i][j] > -1)

			{
				a[i][j] = b[i];

				break;
			}

			cout << b[i];

		}

	}

	system("pause");
	return 0;

}