C++ :

#include<bits/stdc++.h>
using namespace std;
using LL=long long;
using PLL=pair<LL,LL>;
const LL INF=0x3f3f3f3f3f3f3f3f;
const double EPS=1e-10;

const int N=5e1+10;
char g[N][N];

void solve() {
	LL r,c;
	cin>>r>>c;
	for (LL i=1; i<=r; i++) {
		for (LL j=1; j<=c; j++) {
			cin>>g[i][j];
		}
	}
	
	vector<PLL> ans;
	for (LL i=1; i<=r; i++) {
		for (LL j=1; j<=c; j++) {
			bool horizontal=(j+2<=c&&
							 g[i][j]=='.'&&
							 g[i][j+1]=='.'&&
							 g[i][j+2]=='.'&&
							 (j==1||g[i][j-1]=='#'));
			bool vertical  =(i+2<=r&&
							 g[i][j]=='.'&&
							 g[i+1][j]=='.'&&
							 g[i+2][j]=='.'&&
							 (i==1||g[i-1][j]=='#'));
			if (horizontal || vertical) {
				ans.push_back({i,j});
			}
	  	}
	}
	
	cout<<ans.size()<<"\n";
	for (const auto &item : ans) {
		cout<<item.first<<" "<<item.second<<"\n";
	}
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie (0);
	
	//freopen("crosswords.in", "r", stdin);
	//freopen("crosswords.out", "w", stdout);

	int T=1;
	//cin>>T;
	for (int i=1; i<=T; i++) {
		//cout<<i<<"\n";
	    solve();
	}
	return 0;
}