#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
int32_t main()
{
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
int n, m, ynt = 0;
cin>>n>>m;
vector<string> vec(n);
vector<vector<int>> bob(n,vector<int>(m));
for (int i = 0; i < n; ++i)
{
cin>>vec[i];
}
if (n > 2)
{
for (int i = 0; i < n-2; ++i)
{
for (int j = 0; j < m; ++j)
{
if (vec[i][j] == 'R' && vec[i+1][j] == 'G' && vec[i+2][j] == 'W' &&
bob[i][j] == 0 && bob[i+1][j] == 0 && bob[i+2][j] == 0)
{
++ynt;
bob[i][j] = 1;
bob[i+1][j] = 1;
bob[i+2][j] = 1;
}
}
}
}
if (m > 2)
{
for (int i = 0; i < n; ++i)
{
for (int j = 0; j < m-2; ++j)
{
if (vec[i][j] == 'R' && vec[i][j+1] == 'G' && vec[i][j+2] == 'W' &&
bob[i][j] == 0 && bob[i][j+1] == 0 && bob[i][j+2] == 0)
{
++ynt;
bob[i][j] = 1;
bob[i][j+1] = 1;
bob[i][j+2] = 1;
}
}
}
}
cout<<ynt<<endl;
return 0;
}
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