#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int H, W;
    cin >> H >> W;

    vector<string> S(H);
    for (auto &s : S) cin >> s;

    vector<pair<int, int>> ans;

    for (int i = 0; i < H; ++i) {
        for (int j = 0; j < W; ++j) {
            if (S[i][j] == '#') continue;

            // 横のカギ
            bool horizontal =
                (j == 0 || S[i][j - 1] == '#') &&
                (j + 1 < W && S[i][j + 1] == '.');

            // 縦のカギ
            bool vertical =
                (i == 0 || S[i - 1][j] == '#') &&
                (i + 1 < H && S[i + 1][j] == '.');

            if (horizontal || vertical) {
                ans.emplace_back(i + 1, j + 1);
            }
        }
    }

    cout << ans.size() << '\n';
    for (auto [r, c] : ans) {
        cout << r << ' ' << c << '\n';
    }

    return 0;
}