#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 = 0; j < m; j++){
if (s[i][j] != 'G')
continue;
if (i > 0 and i < n - 1 and s[i - 1][j] == 'R' and s[i + 1][j] == 'W' and !mark[i - 1][j])
answer ++, mark[i][j] = mark[i - 1][j] = mark[i + 1][j] = 1;
else if (j > 0 and j < m - 1 and s[i][j - 1] == 'R' and s[i][j + 1] == 'W' and !mark[i][j + 1])
answer ++, mark[i][j] = mark[i][j - 1] = mark[i][j + 1] = 1;
}
}
cout << answer << '\n';
}
