#include "bits/stdc++.h"
using namespace std;
#define ar array
signed main(){
ios::sync_with_stdio(0); cin.tie(0);
int n, m; cin>>n>>m;
vector<string> a(n);
for(int i=0;i<n;i++){
cin>>a[i];
}
vector<vector<int>> is(n, vector<int>(m));
int res = 0;
auto can = [&](int i, int j){
return (j+2 < m && !is[i][j] && !is[i][j+1] && !is[i][j+2] &&
a[i][j] == 'R' && a[i][j+1] == 'G' && a[i][j+2] == 'W');
}; auto mark = [&](int i, int j){
res++;
is[i][j] = is[i][j+1] = is[i][j+2] = 1;
};
auto can_ = [&](int i, int j){
return (i+2 < n && !is[i][j] && !is[i+1][j] && !is[i+1][j] &&
a[i][j] == 'R' && a[i+1][j] == 'G' && a[i+2][j] == 'W');
}; auto mark_ = [&](int i, int j){
res++;
is[i][j] = is[i+1][j] = is[i+2][j] = 1;
};
int ch[3][2] = {
{0, 0},
{1, -1},
{2, -2}
};
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
if(can(i, j)){
mark(i, j);
continue;
}
auto check = [&](int x, int y){
return (0 <= x && x < n && 0 <= y && y < m);
};
int c=0;
for(int t=0;t<3;t++){
int x = i + ch[t][0], y = j + ch[t][1];
c += (check(x, y) && can(x, y));
}
if(c <= 1 && can_(i, j)){
mark_(i, j);
}
}
}
cout<<res<<"\n";
}
