#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

mt19937 mt;

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int n, a, b, c;
    cin >> n >> a >> b >> c;
    if (n <= 3) {
        vector<int> x;
        rep(i, a) x.push_back(1);
        rep(i, b) x.push_back(2);
        rep(i, c) x.push_back(3);
        while (true) {
            shuffle(x.begin(), x.end(), mt);
            vector<string> s(n);
            rep(i, n * n) {
                s[i % n].push_back(x[i] + '0');
            }

            int dx[4] = {0, 1, 0, -1};
            int dy[4] = {-1, 0, 1, 0};
            bool ok = true;
            rep(i, n) rep(j, n) {
                if (s[i][j] != '2')
                    continue;
                vector<int> c(3, 0);
                rep(k, 4) {
                    int nx = i + dx[k];
                    int ny = j + dy[k];
                    if (nx < 0 || ny < 0 || nx >= n || ny >= n)
                        continue;
                    c[s[nx][ny] - '1']++;
                }
                if (c[0] != 0 && c[2] != 0) {
                    ok = false;
                }
            }
            if (ok) {
                for (auto t : s)
                    cout << t << endl;
                return 0;
            }
        }
    }
    if (a + c <= b) {
        rep(i, n) {
            rep(j, n) {
                if (a) {
                    cout << '1';
                    a--;
                } else if (b) {
                    cout << '2';
                    b--;
                } else {
                    cout << '3';
                    c--;
                }
            }
            cout << endl;
        }
    } else {
        if (a < c) {
            rep(i, n) {
                rep(j, n) {
                    if (b) {
                        cout << '2';
                        b--;
                    } else if (c) {
                        cout << '3';
                        c--;
                    } else {
                        cout << '1';
                        a--;
                    }
                }
                cout << endl;
            }
        } else {
            rep(i, n) {
                rep(j, n) {
                    if (b) {
                        cout << '2';
                        b--;
                    } else if (a) {
                        cout << '1';
                        a--;
                    } else {
                        cout << '3';
                        c--;
                    }
                }
                cout << endl;
            }
        }
    }
    return 0;
}