#include <cstring>
#include <iostream>
#include <algorithm>

using namespace std;

const int N = 25;

int n, m;
char g[N][N];
bool st[N][N];

int dx[4] = {-1, 0, 1, 0}, dy[4] = {0, 1, 0, -1};

int dfs(int x, int y)
{
    int cnt = 1;

    st[x][y] = true;
    for (int i = 0; i < 4; i ++ )
    {
        int a = x + dx[i], b = y + dy[i];
        if (a < 0 || a >= n || b < 0 || b >= m) continue;
        if (g[a][b] != '.') continue;
        if (st[a][b]) continue;

        cnt += dfs(a, b);
    }

    return cnt;
}

int main()
{
    while (cin >> m >> n, n || m)
    {
        for (int i = 0; i < n; i ++ ) cin >> g[i];

        int x, y;
        for (int i = 0; i < n; i ++ )
            for (int j = 0; j < m; j ++ )
                if (g[i][j] == '@')
                {
                    x = i;
                    y = j;
                }

        memset(st, 0, sizeof st);
        cout << dfs(x, y) << endl;
    }

    return 0;
}

#include <cstring>
#include <iostream>
#include <algorithm>

using namespace std;

const int N = 110;

int n;
char g[N][N];
int xa, ya, xb, yb;
int dx[4] = {-1, 0, 1, 0}, dy[4] = {0, 1, 0, -1};
bool st[N][N];

bool dfs(int x, int y)
{
    if (g[x][y] == '#') return false;
    if (x == xb && y == yb) return true;

    st[x][y] = true;

    for (int i = 0; i < 4; i ++ )
    {
        int a = x + dx[i], b = y + dy[i];
        if (a < 0 || a >= n || b < 0 || b >= n) continue;
        if (st[a][b]) continue;
        if (dfs(a, b)) return true;
    }

    return false;
}

int main()
{
    int T;
    scanf("%d", &T);
    while (T -- )
    {
        scanf("%d", &n);
        for (int i = 0; i < n; i ++ ) scanf("%s", g[i]);
        scanf("%d%d%d%d", &xa, &ya, &xb, &yb);

        memset(st, 0, sizeof st);
        if (dfs(xa, ya)) puts("YES");
        else puts("NO");
    }

    return 0;
}

class Solution {
public:
    int maxChunksToSorted(vector<int>& arr) {
        vector<int> vec(arr);
        sort(arr.begin(), arr.end());
        int ans = 0;
        for(int i = 0; i < vec.size(); i++){
            for(int j = 0; j < arr.size(); j++){
                if(arr[j] != -1 && arr[j] == vec[i]){
                    vec[i] = j;
                    arr[j] = -1;
                    break;
                }
            }
        }
        for(int i = 0; i < vec.size(); ){
            if(vec[i] == i){
                ans++;
                i++;
            }
            else if(vec[i] == vec.size() - 1){
                ans++;
                break;
            }
            else if(vec[i] > i){
                int index = vec[i];
                int j = i + 1;
                while(j <= index){
                    if(vec[j] > index){
                        index = vec[j];
                    }
                    j++;
                }
                if(j == vec.size()){
                    ans++;
                    break;
                }
                else{
                    ans++;
                    i = index + 1;
                }
            }
        }


        return ans;
    }
};

//直接暴力
class Solution {
public:
    vector<vector<int>> groupThePeople(vector<int>& groupSizes) {
        vector<vector<int>> ret;
        vector<int> vec;
        for(int i = 0; i < groupSizes.size(); i++){
            if(groupSizes[i] == 0){
                continue;
            }
            int t = groupSizes[i];
            vec.push_back(i);
            int k = 1;
            for(int j = i + 1; j < groupSizes.size(); j++){
                if(groupSizes[j] != 0 && k < t && groupSizes[j] == t){
                    vec.push_back(j);
                    groupSizes[j] = 0;
                    k++;
                }
                if(k == t){
                    break;
                }
            }
            ret.push_back(vec);
            vec.clear();
        }
        return ret;
    }
};