#include <bits/stdc++.h>
 
//    #include <boost/multiprecision/cpp_int.hpp>
 #define int long long
 #define inf  1000000007
 #define pa pair<int,int>
 #define ll long long
 #define pal pair<double,double>
 #define ppap pair<pa,int>
  #define PI 3.14159265358979323846
  #define paa pair<int,char>
  #define  mp make_pair
  #define  pb push_back
  #define EPS (1e-8)
                                          
    int dx[8]={0,1,0,-1,1,1,-1,-1};
    int dy[8]={1,0,-1,0,-1,1,1,-1};
                                            using namespace std;
                                   			class pa3{
                                            	public:
                                            	int x;
                                   				int y,z;
                                            	pa3(int x=0,int y=0,int z=0):x(x),y(y),z(z) {}
                                            	bool operator < (const pa3 &p) const{
                                            		if(x!=p.x) return x<p.x;
                                            		if(y!=p.y) return y<p.y;
                                            		 return z<p.z;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                   				bool operator > (const pa3 &p) const{
                                            		if(x!=p.x) return x>p.x;
                                            		if(y!=p.y) return y>p.y;
                                            		 return z>p.z;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa3 &p) const{
                                            		return x==p.x && y==p.y && z==p.z;
                                            	}
                                            		bool operator != (const pa3 &p) const{
                                            			return !( x==p.x && y==p.y && z==p.z);
                                            	}
                                            
                                            };
                                            
                                            class pa4{
                                            	public:
                                            	int x;
                                            	int y,z,w;
                                            	pa4(int x=0,int y=0,int z=0,int w=0):x(x),y(y),z(z),w(w) {}
                                            	bool operator < (const pa4 &p) const{
                                            		if(x!=p.x) return x<p.x;
                                            		if(y!=p.y) return y<p.y;
                                            		if(z!=p.z)return z<p.z;
                                            		return w<p.w;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator > (const pa4 &p) const{
                                            		if(x!=p.x) return x>p.x;
                                            		if(y!=p.y) return y>p.y;
                                            		if(z!=p.z)return z>p.z;
                                            		return w>p.w;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa4 &p) const{
                                            		return x==p.x && y==p.y && z==p.z &&w==p.w;
                                            	}
                                            		
                                            
                                            };
                                            class pa2{
                                            	public:
                                            	int x,y;
                                            	pa2(int x=0,int y=0):x(x),y(y) {}
                                            	pa2 operator + (pa2 p) {return pa2(x+p.x,y+p.y);}
                                            	pa2 operator - (pa2 p) {return pa2(x-p.x,y-p.y);}
                                            	bool operator < (const pa2 &p) const{
                                            		return y != p.y ? y<p.y: x<p.x;
                                            	}
                                            	bool operator > (const pa2 &p) const{
                                            		return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa2 &p) const{
                                            		return abs(x-p.x)==0 && abs(y-p.y)==0;
                                            	}
                                            	bool operator != (const pa2 &p) const{
                                            		return !(abs(x-p.x)==0 && abs(y-p.y)==0);
                                            	}
                                            		
                                            
                                            };
                                            
 
                      
                                string itos( int i ) {
                                ostringstream s ;
                                s << i ;
                                return s.str() ;
                                }
                                 
                                int gcd(int v,int b){
                                	if(v==0) return b;
                                	if(b==0) return v;
                                	if(v>b) return gcd(b,v);
                                	if(v==b) return b;
                                	if(b%v==0) return v;
                                	return gcd(v,b%v);
                                }
                 
                            
                                int mod;
int extgcd(int a, int b, int &x, int &y) {
    if (b == 0) {
        x = 1;
        y = 0;
        return a;
    }
    int d = extgcd(b, a%b, y, x);
    y -= a/b * x;
    return d;
}
pa operator+(const pa & l,const pa & r) {   
    return {l.first+r.first,l.second+r.second};                                    
}    
pa operator-(const pa & l,const pa & r) {   
    return {l.first-r.first,l.second-r.second};                                    
}  
                                
                int pr[10000100];
                int inv[10000010];
                
                int beki(int wa,int rr,int warukazu){
                	if(rr==0) return 1%warukazu;
                	if(rr==1) return wa%warukazu;
                	wa%=warukazu;
                	if(rr%2==1) return ((ll)beki(wa,rr-1,warukazu)*(ll)wa)%warukazu;
                	ll zx=beki(wa,rr/2,warukazu);
                	return (zx*zx)%warukazu;
                }
 
                
    			int comb(int nn,int rr){
    				if(rr<0 || rr>nn || nn<0) return 0;
    				int r=pr[nn]*inv[rr];
    				r%=mod;
    				r*=inv[nn-rr];
    				r%=mod;
    				return r;
    			}
               
                void gya(int ert){
                	pr[0]=1;
                	for(int i=1;i<=ert;i++){
                		pr[i]=(pr[i-1]*i)%mod;
                	}
                		inv[ert]=beki(pr[ert],mod-2,mod);
                	for(int i=ert-1;i>=0;i--){
                		inv[i]=inv[i+1]*(i+1)%mod;
                	}
                }
                
              //   cin.tie(0);
    		//	ios::sync_with_stdio(false);
    			//priority_queue<pa3,vector<pa3>,greater<pa3>> pq;            
                 //sort(ve.begin(),ve.end(),greater<int>());
 //   mt19937(clock_per_sec);
  //  mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()) ;
      
       
int h,w;

int ban[3010][3010];
int vis[3010][3010]={};


vector<pa> ve;
void dfs(int x,int y){
	if(vis[x][y]) return;
	ve.pb(mp(x,y));
	vis[x][y]=1;
	for(int i=0;i<4;i++){
		int xx=x+dx[i];
		int yy=y+dy[i];
		if(xx<0 || yy<0 ||xx>=h || yy>=w) continue;
		if(vis[xx][yy])continue;
		if(i<=1 && ban[x][y]+1!=ban[xx][yy])continue;
		if(i>1 && ban[x][y]-1!=ban[xx][yy])continue;
		dfs(xx,yy);
	}
}

int memo[3010][3];
int dp[3010][5];
int solve(){
	sort(ve.begin(),ve.end());
	int d=ve[0].first;
	int e1=inf,e2=-inf;
	for(auto &v:ve){
		v.second+=v.first-d;
		e1=min(e1,v.second);
		e2=max(e2,v.second);
	}
	if(e2-e1!=2)return 0;
	for(auto &v:ve){
		v.first-=d;
		v.second-=e1;
	}
	
	int R=ve.back().first+1;
	for(int i=0;i<=R;i++)for(int j=0;j<3;j++){
		memo[i][j]=0;
		
	}	
	for(int i=0;i<=R;i++)for(int j=0;j<=3;j++){
		dp[i][j]=0;
		
	}	
	for(auto v:ve)memo[v.first][v.second]=1;
	
	
	for(int i=0;i<R;i++){
		
		if(memo[i][0]+memo[i][1]+memo[i][2]==3){
			
			dp[i+1][0]=max(dp[i+1][0],max({dp[i][0],dp[i][1],dp[i][2],dp[i][3]})+1);
		}
		
		if(i>=2){
			if(memo[i-2][0]+memo[i-1][1]+memo[i][2]==3){
				
				dp[i+1][3]=max(dp[i+1][3],max({dp[i][2],dp[i][3]})+1);
			}
		}
		
		dp[i+1][1]=max(dp[i+1][1],dp[i][0]);
		dp[i+1][2]=max(dp[i+1][2],dp[i][1]);
		dp[i+1][3]=max({dp[i+1][3],dp[i][2],dp[i][3]});
		

		
	}
/*
	for(int i=0;i<R;i++){
		for(int j=0;j<3;j++){
		cout<<memo[i][j]<<" ";
		}
		cout<<endl;
	}
	cout<<endl;
	
	cout<<max({dp[R][0],dp[R][1],dp[R][2],dp[R][3]})<<endl;
	cout<<endl;
*/
	return max({dp[R][0],dp[R][1],dp[R][2],dp[R][3]});
	
}

signed main(){
	
	
   cin.tie(0);
	ios::sync_with_stdio(false);
	
	cin>>h>>w;
	for(int i=0;i<h;i++){
		string s;
		cin>>s;
		for(int j=0;j<w;j++){
			if(s[j]=='R')ban[i][j]=0;
			else if(s[j]=='G')ban[i][j]=1;
			else if(s[j]=='W')ban[i][j]=2;
			else ban[i][j]=inf;
		//cout<<i<<" "<<j<<" "<<ban[i][j]<<endl;	
		}
		
	}
	int ans=0;
	for(int i=0;i<h;i++)for(int j=0;j<w;j++)if(!vis[i][j])if(ban[i][j]==0){
	//	cout<<i<<" "<<j<<endl;
		ve.clear();
		dfs(i,j);
		//cout<<"d"<<endl;
		int y=solve();
		ans+=y;
	}
	cout<<ans<<endl;
	
return 0;
	

 
 }



Measured memory_bytes: 145024