#nullable enable

using System.Runtime.CompilerServices;

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Split(' ', StringSplitOptions.RemoveEmptyEntries), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

var n = I<int>();
var a = I<int>();
var b = I<int>();
var c = I<int>();

var g = new Grid2<int>(n, n);
if (Math.Max(a, Math.Max(b, c)) < n + n)
{
    var q = new Queue<(int, int)>();
    for (var i = 0; i < n; i++)
    {
        if (b == 0) break;
        b--;
        g[i, 0] = 2;
        q.Enqueue((i, 0));
    }
    for (var j = 1; j < n; j++)
    {
        if (b == 0) break;
        b--;
        g[0, j] = 2;
        q.Enqueue((j, 0));
    }
    ReadOnlySpan<(int, int)> moves = [(-1, 0), (0, -1), (0, 1), (1, 0)];
    if (a > c)
    {
        while (q.Count > 0)
        {
            var (i, j) = q.Dequeue();
            foreach (var (di, dj) in moves)
            {
                var (ni, nj) = (i + di, j + dj);
                if (g.Inside(ni, nj) && g[ni, nj] == 0)
                {
                    a--;
                    g[ni, nj] = 1;
                }
            }
        }
    }
    else
    {
        while (q.Count > 0)
        {
            var (i, j) = q.Dequeue();
            foreach (var (di, dj) in moves)
            {
                var (ni, nj) = (i + di, j + dj);
                if (g.Inside(ni, nj) && g[ni, nj] == 0)
                {
                    c--;
                    g[ni, nj] = 3;
                }
            }
        }
    }
}
{
    var nz = new (int, int)[]{ (a, 1), (b, 2), (c, 3) };
    Array.Sort(nz);
    var x = 3;
    var k = 0;
    var m = -1;
    for (var i = 0; i < n; i++) for (var j = 0; j < n; j++)
    {
        if (g[i, j] != 0) continue;
        while (k <= 0)
        {
            x--;
            (k, m) = nz[x];
        }
        k--;
        g[i, j] = m;
    }
}
Console.WriteLine(g.Joined());

partial class Grid2<T>(int _l0, int _l1)
{
    public int L0 => _l0;
    public int L1 => _l1;
    readonly T[] _data = new T[_l0 * _l1];

    public ref T this[int i, int j]
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get => ref _data[i * _l1 + j];
    }
    public void Fill(T value) => _data.AsSpan().Fill(value);
    public bool Inside(int i, int j) => (uint)i < (uint)_l0 && (uint)j < (uint)_l1;
}

partial class Grid2<T>
{
    public ReadOnlySpan<T> Row(int i) => _data.AsSpan(i * _l0, _l1);
    public string Joined()
    {
        var res = new List<string>();
        for (var i = 0; i < _l0; i++) res.Add(string.Join("", [.. Row(i)]));
        return string.Join(Environment.NewLine, res);
    }
}