#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int w, h, x; cin >> w >> h >> x;
    if(w%3 == 2 && h%3 == 2){
        if(x <= 36){
            vector<int> v(4);
            for(int i = 0; i < 4; i++){
                v[i] = x/4+(x%4 > i ? 1 : 0);
            }
            for(int i = 0; i < h; i++){
                for(int j = 0; j < w; j++){
                    if(i%3 != 2 && j%3 != 2){
                        int idx = (i%3)*2+(j%3);
                        cout << v[idx];
                    }else{
                        cout << 0;
                    }
                }
                cout << endl;
            }
        }else{
            cout << -1 << endl;
        }
    }else if(w%3 == 2){
        if(x <= 18){
            vector<int> v(2);
            for(int i = 0; i < 2; i++){
                v[i] = x/2+(x%2 > i ? 1 : 0);
            }
            for(int i = 0; i < h; i++){
                for(int j = 0; j < w; j++){
                    if(i%3 != 2 && i%3 != h%3 && j%3 != 2){
                        int idx = (j%3);
                        cout << v[idx];
                    }else{
                        cout << 0;
                    }
                }
                cout << endl;
            }
        }else{
            cout << -1 << endl;
        }
    }else if(h%3 == 2){
        if(x <= 18){
            vector<int> v(2);
            for(int i = 0; i < 2; i++){
                v[i] = x/2+(x%2 > i ? 1 : 0);
            }
            for(int i = 0; i < h; i++){
                for(int j = 0; j < w; j++){
                    if(i%3 != 2 && j%3 != 2 && j%3 != w%3){
                        int idx = (i%3);
                        cout << v[idx];
                    }else{
                        cout << 0;
                    }
                }
                cout << endl;
            }
        }else{
            cout << -1 << endl;
        }
    }else{
        if(x <= 9){
            for(int i = 0; i < h; i++){
                for(int j = 0; j < w; j++){
                    if(i%3 != 2 && i%3 != h%3 && j%3 != 2 && j%3 != w%3){
                        cout << x;
                    }else{
                        cout << 0;
                    }
                }
                cout << endl;
            }
        }else{
            cout << -1 << endl;
        }
    }
}