//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <string>
#include <cstring>
#include <ctime>
#include <climits>
#include <limits>

using namespace std;

//conversion
//------------------------------------------
inline int toInt(string s) { int v; istringstream sin(s); sin >> v; return v; }
template<class T> inline string toString(T x) { ostringstream sout; sout << x; return sout.str(); }

//math
//-------------------------------------------
template<class T> inline T sqr(T x) { return x * x; }

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;

//container util
//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define EXISTch(s,c) ((((s).find_first_of(c)) != std::string::npos)? 1 : 0)//cがあれば1 if(1)
#define SORT(c) sort((c).begin(),(c).end())

#define REP(i,n) for(int i=0;i<(int)n;++i)
#define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i)

//constant
//--------------------------------------------
const double EPS = 1e-10;
const double PI = acos(-1.0);
const int INF = (int)1000000007;
const LL MOD = (LL)1000000007;//10^9+7
const LL INF2 = (LL)100000000000000000;//10^18

int main() {

	LL h, w, a, b; cin >> h >> w >> a >> b;

	if (b == 0 && a == 0) {

		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				cout << '1';
			}

			cout << endl;
		}
		return 0;
	}

	if (h == 1) {
		if (b == 0) {
			for (int i = 0; i < a; i++) {
				cout << '1';
			}

			for (int i = 0; i < w - a; i++) {
				cout << '0';
			}

			cout << endl;
			return 0;
		}
		else {
			cout << "No" << endl;
			return 0;
		}
	}

	if (w == 1) {
		if (a == 0) {
			for (int i = 0; i < b; i++) {
				cout << '1' << endl;
			}

			for (int i = 0; i < h - b; i++) {
				cout << '0' << endl;
			}

			return 0;
		}
		else {
			cout << "No" << endl;
			return 0;
		}
	}

	if (a == 0) {
			for (int i = 0; i < h; i++) {

				if (0 <= i && i < b) {
					for (int j = 0; j < w; j++) {
						cout << '1';
					}
				}
				else {
					for (int j = 0; j < w; j++) {
						cout << '0';
					}
				}

				cout << endl;
				
			}
			
			return 0;
		
	}
	

	if (b == 0) {

		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				if (0 <= j && j < a) {
					cout << '1';
				}
				else {
					cout << '0';
				}
				
			}

			cout << endl;
		}

		
		return 0;
		
	}
	

	for (int i = 0; i < h; i++) {
		if (0 <= i && i < (h - b)) {
			for (int j = 0; j < w; j++) {
				if (0 <= j && j < a) {
					cout << '1';
				}
				else {
					cout << '0';
				}
			}

			cout << endl;
			
		}
		else {
			for (int j = 0; j < w; j++) {
				if (0 <= j && j < a) {
					cout << '0';
				}
				else {
					cout << '1';
				}
			}

			cout << endl;
		
		}
		
	}
	
	return 0;
}

Measured memory_bytes: 1280