#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int minDist(const vector<string>& plane, char wall, int y1, int x1, int y2, int x2)
{
    int dy[] = {0, 0, -1, 1};
    int dx[] = {-1, 1, 0, 0};

    int h = plane.size();
    int w = plane[0].size();

    queue<pair<int, int> > q;
    vector<vector<bool> > check(h, vector<bool>(w, false));
    q.push(make_pair(y1, x1));
    check[y1][x1] = true;
    int ret = 0;
    while(!q.empty()){
        queue<pair<int, int> > q1;
        while(!q.empty()){
            int y = q.front().first;
            int x = q.front().second;
            q.pop();
            if(y == y2 && x == x2)
                return ret;
            for(int i=0; i<4; ++i){
                int y0 = y + dy[i];
                int x0 = x + dx[i];
                if(plane[y0][x0] != wall && !check[y0][x0]){
                    q1.push(make_pair(y0, x0));
                    check[y0][x0] = true;
                }
            }
        }
        ++ ret;
        q.swap(q1);
    }
    return -1;
}

int main()
{
    int w, h, n;
    cin >> w >> h >> n;
    vector<string> s(2*h+1, string(2*w+1, '#'));
    for(int y=0; y<h; ++y){
        for(int x=0; x<w; ++x){
            s[2*y+1][2*x+1] = '.';
        }
    }

    vector<vector<int> > a(h, vector<int>(w, 0));
    vector<vector<int> > b(h, vector<int>(w, 0));
    for(int i=0; i<n; ++i){
        int m, z1;
        cin >> m >> z1;

        for(int j=0; j<m; ++j){
            int z2;
            cin >> z2;
            int y1 = z1 / w;
            int x1 = z1 % w;
            int y2 = z2 / w;
            int x2 = z2 % w;
            if(y1 == y2){
                if(x2 < x1)
                    swap(x1, x2);
                ++ a[y1][x1];
                -- a[y1][x2];
            }
            else{
                if(y2 < y1)
                    swap(y1, y2);
                ++ b[y1][x1];
                -- b[y2][x1];
            }
            z1 = z2;
        }
    }

    for(int y=0; y<h; ++y){
        int sum = 0;
        for(int x=0; x<w; ++x){
            sum += a[y][x];
            if(sum > 0)
                s[2*y+1][2*x+2] = '.';
        }
    }
    for(int x=0; x<w; ++x){
        int sum = 0;
        for(int y=0; y<h; ++y){
            sum += b[y][x];
            if(sum > 0)
                s[2*y+2][2*x+1] = '.';
        }
    }

    int ans = minDist(s, '#', 1, 1, 2 * h - 1, 2 * w - 1);
    if(ans == -1)
        cout << "Odekakedekinai.." << endl;
    else
        cout << (ans / 2) << endl;

    return 0;
}