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