#include <cstdio>
#include <vector>
#include <set>
#include <queue>
#include <cstdint>
#include <cassert>
#define repeat(i,n) for (int i = 0; (i) < (n); ++(i))
#define repeat_from(i,m,n) for (int i = (m); (i) < (n); ++(i))
using namespace std;
const int UP    = 0;
const int DOWN  = 1;
const int RIGHT = 2;
const int LEFT  = 3;
const int dy[4] = { -1, 1, 0, 0 };
const int dx[4] = { 0, 0, 1, -1 };
struct state_t { int dist, v; };
int main() {
    int w, h, n; scanf("%d%d%d", &w, &h, &n);
    vector<uint8_t> g(h * w);
    repeat (i,n) {
        int m; scanf("%d", &m);
        vector<int> b(m+1); repeat (i,m+1) scanf("%d", &b[i]);
        repeat (i,m) {
            int y0 = b[i]   / w;
            int y1 = b[i+1] / w;
            int x0 = b[i]   % w;
            int x1 = b[i+1] % w;
            if (y0 == y1) {
                int y = y0;
                repeat_from (z,min(x0,x1),max(x0,x1)) {
                    g[y * w +  z   ] |= (1 << RIGHT);
                    g[y * w + (z+1)] |= (1 << LEFT);
                }
            } else if (x0 == x1) {
                int x = x0;
                repeat_from (z,min(y0,y1),max(y0,y1)) {
                    g[ z    * w + x] |= (1 << DOWN);
                    g[(z+1) * w + x] |= (1 << UP);
                }
            } else {
                assert (false);
            }
        }
    }
    vector<int> dist(h * w);
    queue<state_t> que;
    dist[0] = 1;
    que.push((state_t) { 1, 0 });
    while (not que.empty()) {
        state_t s = que.front(); que.pop();
        int y = s.v / w;
        int x = s.v % w;
        repeat (i,4) {
            if (not (g[s.v] & (1 << i))) continue; // the edge doesn't exist
            int ny = y + dy[i];
            int nx = x + dx[i];
            if (ny < 0 or h <= ny or nx < 0 or w <= nx) continue;
            state_t t = { s.dist + 1, ny * w + nx };
            if (dist[t.v]) continue;
            dist[t.v] = t.dist;
            que.push(t);
        }
    }
    if (dist[h * w - 1]) {
        printf("%d\n", dist[h * w - 1] - 1);
    } else {
        puts("Odekakedekinai..");
    }
    return 0;
}