import core.bitop, std.algorithm, std.ascii, std.bigint, std.conv, std.math,
    std.functional, std.numeric, std.range, std.stdio, std.string, std.random,
    std.typecons, std.container, std.format;

// dfmt off
T lread(T = long)(){return readln.chomp.to!T();}
T[] aryread(T = long)(){return readln.split.to!(T[])();}
void scan(TList...)(ref TList Args){auto line = readln.split();
foreach (i, T; TList){T val = line[i].to!(T);Args[i] = val;}}
alias sread = () => readln.chomp();enum MOD = 10 ^^ 9 + 7;
alias PQueue = BinaryHeap!(Array!long, "a<b");
// dfmt on

void main()
{
    long H, W, A, B;
    scan(H, W, A, B);
    foreach (_; 0 .. B)
    {
        if (A)
            write(0);
        foreach (__; 1 .. A)
            write(" 0");
        foreach (__; 0 .. W - A)
            write(" 1");
        writeln();
    }
    foreach (_; 0 .. H - B)
    {
        if (A)
            write(1);
        foreach (__; 1 .. A)
            write(" 1");
        foreach (__; 0 .. W - A)
            write(" 0");
        writeln();
    }
}
