def main():
    h, w, m = list(map(int, input().split()))
    if m == 0:
        print(-1)
        return
    print(-1)
    return
    if not h % 2 and not w % 2:
        assert 0
    from collections import deque
    dq = deque([i for i in range(h*w)])
    Ans = [[-1 for _ in range(w)] for _ in range(h)]
    m0 = m1 = m-1
    for x in range(w):
        if not x % 2:
            Y = [i for i in range(h)]
        else:
            Y = [i for i in range(h-1, -1, -1)]
        for y in Y:
            if not m0 and not m1:
                Ans[y][x] = dq.popleft()
            if not (x+y) % 2:
                if m0:
                    Ans[y][x] = dq.popleft()
                    m0 -= 1
            else:
                if m1:
                    Ans[y][x] = dq.pop()
                    m1 -= 1
    for ans in Ans:
        print(*[a+1 for a in ans])

main()