import sys

h, w, m = map(int, sys.stdin.buffer.read().split())
total, middle_count = h * w, h * w - 2 * m
if m == 0 or (h > 1 and w > 1 and h % 2 and w % 2 and middle_count == 1):
    print(-1)
    raise SystemExit
cells = [(r, c) for r in range(h) for c in (range(w) if r % 2 == 0 else range(w - 1, -1, -1))]
grid = [[0] * w for _ in range(h)]
dense = h > 1 and w > 1 and h % 2 and w % 2 and middle_count <= 2 * w - 3
if dense:
    values = list(range(m + 1, m + middle_count + 1))
    values[-2], values[-1] = values[-1], values[-2]
    for (r, c), value in zip(cells, values):
        grid[r][c] = value
    low, high = 1, total
    for r in range(h):
        for c in range(w):
            if not grid[r][c]:
                if (r + c) % 2 == 0:
                    grid[r][c], high = high, high - 1
                else:
                    grid[r][c], low = low, low + 1
else:
    k, low, high, middle = m - 1, 1, total, m
    for index, (r, c) in enumerate(cells, 1):
        if index <= 2 * k:
            if index % 2:
                grid[r][c], low = low, low + 1
            else:
                grid[r][c], high = high, high - 1
        else:
            grid[r][c], middle = middle, middle + 1
print("\n".join(" ".join(map(str, row)) for row in grid))