import sys

# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = (1 << 63)-1
# inf = (1<<31)-1
# md = 10**9+7
md = 998244353

def main():
    from collections import deque

    w, h, n = LI()

    row = [0]*h
    col = [0]*w

    for _ in range(n):
        m = II()
        bb = LI()
        for k in range(m):
            i, j = divmod(bb[k], w)
            s, t = divmod(bb[k+1], w)
            if i == s:
                if j > t: j, t = t, j
                row[i] |= (1 << t-j)-1 << j
            else:
                if i > s: i, s = s, i
                col[j] |= (1 << s-i)-1 << i

    # for a in row: print(bin(a)[2:].zfill(w))
    # for a in col: print(bin(a)[2:].zfill(h))

    def push(ij):
        dist[ij] = d+1
        if ij == h*w-1: return True
        q.append(ij)
        return False

    dist = [-1]*h*w
    q = deque([0])
    dist[0] = 0
    while q:
        ij = q.popleft()
        d = dist[ij]
        i, j = divmod(ij, w)
        if j and row[i] >> j-1 & 1 and dist[ij-1] == -1:
            if push(ij-1): break
        if j+1 < w and row[i] >> j & 1 and dist[ij+1] == -1:
            if push(ij+1): break
        if i and col[j] >> i-1 & 1 and dist[ij-w] == -1:
            if push(ij-w): break
        if i+1 < h and col[j] >> i & 1 and dist[ij+w] == -1:
            if push(ij+w): break
        # pDB(i,j,dist)

    ans = dist[-1]
    if ans == -1: ans = "Odekakedekinai.."
    print(ans)

main()