#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
int main()
{
    int n, m;
    cin >> n >> m;
    int mm = m;
    cout << fixed << setprecision(10);

    if(n == 2) {
        for(int i = 1; i <= m - 1; i ++) {
            cout << 0.0 << " ";
        }
        cout << 1.0 << endl;
        for(int i = 1; i <= m - 1; i ++) {
            cout << 0.0 << " ";
        }
        cout << 1.0 << endl;
        return 0;
    }

    if ((n + 1) / 2 < m) m = (n + 1) / 2;
    mm = mm - m;
    
    int b = m, i;
    for (i = 1; i <= n; i++)
    {
        for (int j = 1; j <= mm; j++) cout << 0.0 << ' ';
        for (int j = 1; j < b; j++) cout << 0.0 << ' ';
        cout << 1.0 << ' ';
        for (int j = b + 1; j <= m; j++) cout << 0.0 << ' ';
        cout << '\n';
        b--;
        if (b == 0) 
        {
            i++;
            break;
        }
    }
    b = 1;
    for (; i <= n; i++)
    {
        for (int j = 1; j <= mm; j++) cout << 0.0 << ' ';
        for (int j = 1; j < b; j++) cout << 0.0 << ' ';
        cout << 1.0 << ' ';
        for (int j = b + 1; j <= m; j++) cout << 0.0 << ' ';
        cout << '\n';
        b++;
        if (b > m) b = 1;
    }
}