This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	int n,m;
	vector<string>ciag;
	string napis;
	cin >> n >> m;
	for(int i=0;i<n;++i){
		cin >> napis;
		ciag.push_back(napis);	
	}
	int suma=0;
	for(int i=0;i<n;++i){
		for(int j=0;j<m;++j){
			if(j+2<m && ciag[i][j]=='R' && ciag[i][j+1]=='G' && ciag[i][j+2]=='W'){
				if(i+1 < n && i>0 && ciag[i-1][j+1]=='R' && ciag[i][j+1]=='G' && ciag[i+1][j+1]=='W'){
					ciag[i-1][j+1]='X';
					ciag[i][j+1]='X';
					ciag[i][j+2]='X';
				}
				else{
					ciag[i][j]='X';
					ciag[i][j+1]='X';
					ciag[i][j+2]='X';
				}
				suma++;
			}
			if(i>0 && i+1<n && ciag[i][j]=='G' && ciag[i-1][j]=='R' && ciag[i+1][j]=='W'){
				//cout << i << " : " << j << "\n";
				ciag[i][j]='X'; 
				ciag[i-1][j]='X'; 
				ciag[i+1][j]='X';
				suma++;
			}
		}	
	}
	/*for(int i=0;i<n;++i){
		for(int j=0;j<m;++j){
			cout << ciag[i][j];
		}	
		cout << endl;
	}
	*/
	cout << suma;
	return 0;
	}
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