#include<iostream>
#include<vector>
#include<queue>
#include<cstring>
#include<cstdio>
#define r first
#define c second
using namespace std;
typedef pair<int, int> Point;
const int BUF = 1005;


int dr[] = {1, 0, -1, 0};
int dc[] = {0, 1, 0, -1};

int row, col;
bool canPass[BUF][BUF][4];


void read() {
    memset(canPass, 0, sizeof(canPass));
    
    int nRoute;
    scanf("%d%d%d", &col, &row, &nRoute);

    static int hLineDiff[BUF][BUF];
    static int vLineDiff[BUF][BUF];
    memset(hLineDiff, 0 , sizeof(hLineDiff));
    memset(vLineDiff, 0 , sizeof(vLineDiff));
    
    for (int i = 0; i < nRoute; ++i) {
        int nPt;
        scanf("%d", &nPt);
        nPt++;
        
        vector<Point> ptList;
        for (int j = 0; j < nPt; ++j) {
            int v;
            scanf("%d", &v);
            ptList.push_back(Point(v / col, v % col));
        }

        
        for (int j = 0; j + 1 < nPt; ++j) {
            Point &cur = ptList[j];
            Point &nex = ptList[j + 1];

            if (cur.r == nex.r) {
                ++hLineDiff[cur.r][min(cur.c, nex.c)];
                --hLineDiff[cur.r][max(cur.c, nex.c)];
            }
            else {
                ++vLineDiff[min(cur.r, nex.r)][cur.c];
                --vLineDiff[max(cur.r, nex.r)][cur.c];
            }
        }
    }
    
    for (int r = 0; r < row; ++r) {
        int sum = 0;
        for (int c = 0; c + 1 < col; ++c) {
            sum += hLineDiff[r][c];
            if (sum > 0) {
                canPass[r][c][1] = canPass[r][c + 1][3] = true;
            }
        }
    }

    for (int c = 0; c < col; ++c) {
        int sum = 0;
        for (int r = 0; r + 1 < row; ++r) {
            sum += vLineDiff[r][c];
            if (sum > 0) {
                canPass[r][c][0] = canPass[r + 1][c][2] = true;
            }
        }
    }
}


void work() {
    static int cost[BUF][BUF];
    queue<Point> Q;
    
    memset(cost, -1, sizeof(cost));
    cost[0][0] = 0;
    Q.push(Point(0, 0));
    
    while (!Q.empty()) {
        Point cur = Q.front();
        Q.pop();
        
        if (cur.r == row - 1 && cur.c == col - 1) {
            cout << cost[cur.r][cur.c] << endl;
            return;
        }
        
        for (int i = 0; i < 4; ++i) {
            int nr = cur.r + dr[i];
            int nc = cur.c + dc[i];
            
            if (!canPass[cur.r][cur.c][i]) continue;
            if (!(0 <= nr && nr < row && 0 <= nc && nc < col)) continue;
            if (cost[nr][nc] != -1) continue;

            cost[nr][nc] = cost[cur.r][cur.c] + 1;
            Q.push(Point(nr, nc));
        }
    }

    cout << "Odekakedekinai.." << endl;
}


int main() {
    read();
    work();
    return 0;
}