#include <bits/stdc++.h>
using namespace std;
#define int long long
#define sp <<" "<<
int inf = 2e18;
void solve()
{
int n=0,m=0;
cin>>n>>m;
char dizi[n][m];
if(n<3||m<3)
{
cout<<0;
return;
}
for(int i=0;i<n;i++)
{
for(int j =0;j<m;j++)
{
cin>>dizi[i][j];
}
}
int semboller=0;
for(int i=0;i<n;i++)
{
for(int j =0;j<m;j++)
{
if(dizi[i][j]=='R')
{
if(n-i>2)if(dizi[i+1][j]=='G'&&dizi[i+2][j]=='W')
{
dizi[i][j]='0';
dizi[i+1][j]='0';
dizi[i+2][j]='0';
semboller++;
}
if(m-j>2)if(dizi[i][j+1]=='G'&&dizi[i][j+2]=='W')
{
dizi[i][j]='0';
dizi[i][j+1]='0';
dizi[i][j+2]='0';
semboller++;
}
}
}
}
cout<<semboller;
}
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
#ifdef faruk
freopen("in.txt", "r", stdin);
freopen("out.txt", "w", stdout);
#endif
int t = 1;
//cin>>t;
while (t--) solve();
return 0;
}
