#include <bits/stdc++.h>
using namespace std;
int main(){
int n,m;
cin>>n>>m;
char ar[n][m];
bool u[n][m];
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
cin >> ar[i][j];
u[i][j]=false;
}
}
int sayac=0;
for(int i=0;i<n;i++){
for(int j=0;j+2<m;j++){
if(!u[i][j]&&!u[i][j+1]&&!u[i][j+2]){
if(ar[i][j]=='R'){
if(ar[i][j+1]=='G'){
if(ar[i][j+2]=='W'){
sayac++;
u[i][j]=true;
u[i][j+1]=true;
u[i][j+2]=true;
}
}
}
}
}
}
for(int i=0;i+2<n;i++){
for(int j=0;j<m;j++){
if(!u[i][j]&&!u[i+1][j]&&!u[i+2][j]){
if(ar[i][j]=='R'){
if(ar[i+1][j]=='G'){
if(ar[i+2][j]=='W'){
sayac++;
u[i][j]=true;
u[i+1][j]=true;
u[i+2][j]=true;
}
}
}
}
}
}
cout<<sayac;
}
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