#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
const int maxn = 3000 + 10;
const int inf = 1e9;
bool mark[maxn][maxn];
string s[maxn];
int main(){
ios_base::sync_with_stdio(false);
int n, m;
cin >> n >> m;
for (int i = 0; i < n; i++)
cin >> s[i];
int answer = 0;
for (int i = 0; i < n; i++){
for (int j = 1; j < m - 1; j++)
if (s[i][j-1] == 'R' and s[i][j] == 'G' and s[i][j+1] == 'W' and !mark[i][j-1] and !mark[i][j] and !mark[i][j-1])
answer ++, mark[i][j-1] = mark[i][j] = mark[i][j+1] = 1;
if (i > 1){
i --;
for (int j = 0; j < m; j++)
if (s[i-1][j] == 'R' and s[i][j] == 'G' and s[i+1][j] == 'W' and !mark[i-1][j] and !mark[i][j] and !mark[i+1][j])
answer ++, mark[i-1][j] = mark[i][j] = mark[i+1][j] = 1;
i ++;
}
}
cout << answer << '\n';
}
