#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; i++) {
for (int j = 0; j < m; j++) {
if (i + 2 < n && 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] = '.';
}
else if (j + 2 < m && 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;
}
