#include <bits/stdc++.h>
using namespace std;
#define int long long
//Her insan insandır ama her insan insan değildir...
map<string,bool>mp;
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int n,m;
cin>>n>>m;
vector<vector<char>>s(n+2,vector<char>(m+2));
vector<vector<bool>>b(n+2,vector<bool>(m+2,0));
for(int i=0;i<=n+1;i++) {
for(int j=0;j<=m+1;j++) {
if(i==n+1||i==0||j==m+1||j==0)s[i][j]='x';
else cin>>s[i][j];
}
}
int ans=0;
for(int i=1;i<=n;i++) {
for(int j=1;j<=m;j++) {
if(s[i][j]=='G'){
if(s[i-1][j]=='R'&&s[i+1][j]=='W'&&b[i-1][j]==0&&b[i+1][j]==0){ans++;
b[i-1][j]=1;
b[i+1][j]=1;
}
else if(s[i][j-1]=='R'&&s[i][j+1]=='W'&&b[i][j-1]==0&&b[i][j+1]==0){ans++;
b[i][j-1]=1;
b[i][j+1]=1;
}
}
}
}
cout<<ans<<endl;
return 0;
}
