W, H, X = map(int, input().split())

if X == 0:
    for _ in range(H):
        print('0' * W)
elif X == 4 and W % 2 == 1:
    # Check if H is even or can be covered by the pattern
    # Create a row like '11011' for W=5
    half = W // 2
    row = '1' * half + '0' + '1' * half
    # Verify that the row has length W
    if len(row) != W:
        print(-1)
    else:
        for _ in range(H):
            print(row)
elif X == 6 and W == 2 and H == 2:
    print("12")
    print("30")
else:
    print(-1)