def solve():
    W, H, hsWH, hsHW = read_data()
    Es = build_edges(W, H, hsWH, hsHW)
    return wfs(Es, W, H)


def read_data():
    W, H, N = map(int, input().split())
    hsWH = [[0] * H for w in range(W)]  # vertical lines
    hsHW = [[0] * W for h in range(H)]  # horizontal lines
    for n in range(N):
        process_move(hsWH, hsHW, W, H)
    return W, H, hsWH, hsHW


def process_move(hsWH, hsHW, W, H):
    Mnotused = input()
    Bs = list(map(int, input().split()))
    h0, w0 = divmod(Bs[0], W)
    for b in Bs:
        h1, w1 = divmod(b, W)
        if h0 == h1:  # horizontal move
            if w0 > w1:
                hsHW[h0][w1] += 1
                hsHW[h0][w0] -= 1
            else:
                hsHW[h0][w0] += 1
                hsHW[h0][w1] -= 1
            w0 = w1
        else:        # vertical move
            if h0 > h1:
                hsWH[w0][h1] += 1
                hsWH[w0][h0] -= 1
            else:
                hsWH[w0][h0] += 1
                hsWH[w0][h1] -= 1
            h0 = h1


def build_edges(W, H, hsWH, hsHW):
    Es = [[0, 0, 0, 0] for idx in range(H * W)]
    process_vertical_move(W, H, hsWH, Es)
    process_horizontal_move(W, H, hsHW, Es)
    return Es


def process_vertical_move(W, H, hsWH, Es):
    for w, hsw in enumerate(hsWH):
        cum = 0
        idx = w
        for val in hsw:
            cum += val
            if cum:
                Es[idx][3] = 1
                Es[idx + W][2] = 1
            idx += W
    

def process_horizontal_move(W, H, hsHW, Es):
    for h, hsh in enumerate(hsHW):
        cum = 0
        idx = h * W
        for val in hsh:
            cum += val
            if cum:
                Es[idx][1] = 1
                Es[idx + 1][0] = 1
            idx += 1


def wfs(Es, W, H):
    '''Es[idx][d]: セルidx番のd方向の辺の有無。（d=0,1,2,3=左、右、下、上=-1,1,-W,W）
    idx=0 から、idx=H*W-1 までの最短距離を幅優先探索で求める。
    '''
    start = 0
    goal = H * W - 1
    unvisited = [True] * (H * W)
    frontiers = [start]
    cost = 0
    while frontiers:
        cost += 1
        new_frontiers = []
        for f in frontiers:
            if f == goal:
                return cost - 1
            Esf = Es[f]
            if Esf[0] and unvisited[f - 1]:
                unvisited[f - 1] = False
                new_frontiers.append(f - 1)
            if Esf[1] and unvisited[f + 1]:
                unvisited[f + 1] = False
                new_frontiers.append(f + 1)
            if Esf[2] and unvisited[f - W]:
                unvisited[f - W] = False
                new_frontiers.append(f - W)
            if Esf[3] and unvisited[f + W]:
                unvisited[f + W] = False
                new_frontiers.append(f + W)
        frontiers = new_frontiers
    return -1
    

ans = solve()
if ans == -1:
    print("Odekakedekinai..")
else:
    print(ans)