#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
ll n,m,cnt=0;
cin >> n >> m;
char c[n+1][m+1];
for (int i=1; i<=n; i++) {
for (int j=1; j<=m; j++) cin >> c[i][j];
}
if (n<3 && m<3) return cout << 0,0;
if (n>=3 && m<3) {
for (int i=1; i<=n; i++) {
for (int j=1; j<=m; j++) {
if (c[i][j]=='R' && c[i+1][j]=='G' && c[i+2][j]=='W') cnt++,c[i][j]='0',c[i+1][j]='0',c[i+2][j]='0';
}
}
}
if (n<3 && m>=3) {
for (int i=1; i<=n; i++) {
for (int j=1; j<=m; j++) {
if (c[i][j]=='R' && c[i][j+1]=='G' && c[i][j+2]=='W') cnt++,c[i][j]='0',c[i][j+1]='0',c[i][j+2]='0';
}
}
}
else {
for (int i=1; i<=n; i++) {
for (int j=1; j<=m; j++) {
if (c[i][j]=='R' && c[i][j+1]=='G' && c[i][j+2]=='W') cnt++,c[i][j]='0',c[i][j+1]='0',c[i][j+2]='0';
}
}
for (int i=1; i<=n; i++) {
for (int j=1; j<=m; j++) {
if (c[i][j]=='R' && c[i+1][j]=='G' && c[i+2][j]=='W') cnt++,c[i][j]='0',c[i+1][j]='0',c[i+2][j]='0';
}
}
}
cout << cnt;
}
