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

if X == 0:
    for _ in range(H):
        print('0' * W)
elif W == 2 and H == 2 and X == 6:
    print("12")
    print("30")
elif X == 4 and H == 2 and W >= 3 and W % 2 == 1:
    mid = W // 2
    row = '1' * mid + '0' + '1' * (mid)
    print(row)
    print(row)
else:
    print(-1)