import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.NoSuchElementException;

public class Main {
	public static void main(String[] args) {
		new Main().run();
	}
	
	void run() {
		FastScanner sc=new FastScanner();
		int W=sc.nextInt();
		int H=sc.nextInt();
		int X=sc.nextInt();
		if ((H%3)*(W%3)*9<X) {
			System.out.println(-1);
			return;
		}
		ArrayList<Integer> list=new ArrayList<>();
		for (int i=0;i<4;++i) {
			int v=Math.min(9,X);
			list.add(v);
			X-=v;
		}
		int[][] two=new int[600][600];
		for (int i=0;i<two.length;++i) {
			for (int j=0;j<two[i].length;++j) {
				if (H%3<W%3) {
					two[i][j]=list.get((j%2+2*(i%2))%4);
				} else {
					two[i][j]=list.get((i%2+2*(j%2))%4);
				}
			}
		}
		int[][] M=new int[H][W];
		for (int i=0;i<H;++i) {
			for (int j=0;j<W;++j) {
				if (i%3==2 || j%3==2) continue;
				M[i][j]=two[2*(i/3)+i%3][2*(j/3)+j%3];
			}
		}
		for (int i=0;i<H;++i) {
			for (int j=0;j<W;++j) {
				System.out.print(M[i][j]+(j==W-1?"\n":""));
			}
		}
	}

	void tr(Object...o) {System.out.println(Arrays.deepToString(o));}
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
        	ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    
    public double nextDouble() { return Double.parseDouble(next());}
}