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