#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];
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(dizi[i+1][j]=='G'&&dizi[i+2][j]=='W')semboller++;
if(dizi[i][j+1]=='G'&&dizi[i][j+2]=='W')
{
semboller++;
j+=2;
}
}
}
}
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;
}
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