572 - Oil Deposits

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define all(x) x.begin(), x.end()
#define sz(x) int(x.size())
#define endl '\n'

int n, m;

void solve() {
    int ans = 0;
    vector<vector<char>> grid(n, vector<char>(m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> grid[i][j];
        }
    }
    vector<vector<bool>> vis(n, vector<bool>(m));
    auto valid = [&](int i, int j) {
        return 0 <= i && i < n && 0 <= j && j < m && !vis[i][j] && grid[i][j] == '@';
    };
    function<void(int , int )> dfs = [&](int i, int j) {
        for (int di = -1; di < 2; di++) {
            for (int dj = -1; dj < 2; dj++) {
                if (!di && !dj) continue;
                int ni = di + i, nj = dj + j;
                if (valid(ni, nj)) {
                    vis[ni][nj] = true;
                    dfs(ni, nj);
                }
            }
        }
    };
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (grid[i][j] == '@' && !vis[i][j]) {
                vis[i][j] = true;
                ans++;
                dfs(i, j);
            }
        }
    }
    cout << ans << endl;
}

int main() {
    cin.tie(0), cin.sync_with_stdio(0);
    while (cin >> n >> m, n && m)
        solve();
}