#include <bits/stdc++.h>
using namespace std;
#define fori for(int i=0;i<n;i++)
#define forj for(int j=0;j<m;j++)
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n,m,count=0;
cin >> n >> m;
vector<vector<char>> grid(n,vector<char>(m));
fori
forj
cin >> grid[i][j];
fori{
for(int j=0; j<=m-3; j++){
if(grid[i][j]=='R' && grid[i][j+1]=='G' && grid[i][j+2]=='W'){
count++;
grid[i][j]=grid[i][j+1]=grid[i][j+2]='x';
}
}
}
forj{
for(int i=0; i<=n-3; i++){
if(grid[i][j]=='R' && grid[i+1][j]=='G' && grid[i+2][j]=='W'){
count++;
grid[i][j]=grid[i+1][j]=grid[i+2][j]='x';
}
}
}
cout << count;
}
