#include <iostream>
#include <cstdio>
#include <vector>
#include <list>
#include <complex>
#include <algorithm>
#include <set>
#include <map>
#include <queue>
#include <string>
#include <cstring>
#include <stack>
#include <cmath>
#include <iomanip>
#include <sstream>
#include <cassert>
#include <numeric>
using namespace std;
typedef long long ll;
typedef ll li;
typedef pair<int,int> PI;
#define EPS (1e-6)
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define REP(i, n) rep (i, n)
#define F first
#define S second
#define mp(a,b) make_pair(a,b)
#define pb(a) push_back(a)
#define min3(a,b,c) min((a),min((b),(c)))
#define min4(a,b,c,d) min((a),min3((b),(c),(d)))
#define SZ(a) (int)((a).size())
#define ALL(a) a.begin(),a.end()
#define FLL(a,b) memset((a),b,sizeof(a))
#define CLR(a) memset((a),0,sizeof(a))
#define FOR(it,a) for(__typeof(a.begin())it=a.begin();it!=a.end();++it)
template<typename T,typename U> ostream& operator<< (ostream& out, const pair<T,U>& val){return out << "(" << val.F << ", " << val.S << ")";}
template<class T> ostream& operator<< (ostream& out, const vector<T>& val){out << "{";rep(i,SZ(val)) out << (i?", ":"") << val[i];return out << "}";}
typedef double FP;
typedef complex<FP> pt;
typedef pt P;
typedef pair<pt,pt> line;
FP dot(P a,P b){return real(conj(a)*b);}
FP crs(P a,P b){return imag(conj(a)*b);}
P ortho(P a){return conj(P(imag(a),real(a)));}
P ortho(line a){return ortho(a.S-a.F);}
P crspt(P a,P b,P c,P d){b-=a,d-=c;return a+b*crs(d,c-a)/crs(d,b);}
P crspt(line a,line b){return crspt(a.F,a.S,b.F,b.S);}
bool onl(P a1,P a2,P b){return abs(b-a1)+abs(b-a2)<abs(a1-a2)+EPS;}
bool onl(line a,P b){return onl(a.F,a.S,b);}
bool iscrs(line a,line b){P c=crspt(a,b);return onl(a,c)&&onl(b,c);}
void pkuassert(bool t){t=1/t;};
int dx[]={0,1,0,-1,1,1,-1,-1};
int dy[]={1,0,-1,0,-1,1,1,-1};
enum{TOP,BTM,LFT,RGT,FRT,BCK};
int dxdy2ce[]={RGT,FRT,LFT,BCK};
template<class T> T shift(T a,int b,int c,int d,int e){
  __typeof(a[0])t=a[b];
  a[b]=a[c];a[c]=a[d];a[d]=a[e];a[e]=t;return a;}
template<class T> T rgt(T a){return shift(a,TOP,LFT,BTM,RGT);}
template<class T> T lft(T a){return shift(a,TOP,RGT,BTM,LFT);}
template<class T> T frt(T a){return shift(a,TOP,BCK,BTM,FRT);}
template<class T> T bck(T a){return shift(a,TOP,FRT,BTM,BCK);}
line mkl(P a,P v){return line(a,a+v);}
FP lpdist(line a,P b){return abs(b-crspt(a,mkl(b,ortho(a))));}
FP spdist(line a,P b){
  P c(crspt(a,mkl(b,ortho(a))));
  return onl(a,c)?abs(b-c):min(abs(a.F-b),abs(a.S-b));
}
FP ssdist(line a,line b){
  return
    min4(spdist(a,b.F),spdist(a,b.S),
         spdist(b,a.F),spdist(b,a.S));
}



string in[500];
int m,n;
bool inr(int nx,int ny,int xx,int xy,int x,int y){
  if(nx>xx) swap(nx,xx);
  if(ny>xy) swap(ny,xy);
  return nx<=x && x<=xx && ny<=y && y<=xy;
}

int main(int argc, char *argv[])
{
  cin >> m >> n;
  rep(i,m)
    cin >> in[i];

  vector<pair<PI,char> > app,ne;
  rep(i,m)rep(j,n) if(in[i][j]!='.') 
    app.pb(mp(mp(i,j),in[i][j]));
  int ans = 0;
  while(true){
    bool end=true;
    ne.clear();
    rep(i,SZ(app))rep(j,i){
      bool ok=true;
      if(app[i].S!=app[j].S) continue;

      int minx=min(app[i].F.F,app[j].F.F);
      int maxx=max(app[i].F.F,app[j].F.F);
      int miny=min(app[i].F.S,app[j].F.S);
      int maxy=max(app[i].F.S,app[j].F.S);
      
      if(app[i].F.F==app[j].F.F){
        if(abs(app[i].F.S-app[j].F.S)==1) ok=false;
        rep(k,SZ(app))
          if(app[k].F.F==app[i].F.F &&
             miny<app[k].F.S && app[k].F.S<maxy) ok=false;
      }else if(app[i].F.S==app[j].F.S){
        if(abs(app[i].F.F-app[j].F.F)==1) ok=false;
        rep(k,SZ(app))
          if(app[k].F.S==app[i].F.S &&
             minx<app[k].F.F && app[k].F.F<maxx) ok=false;
      }else{
        PI p[]={
          mp(minx,miny),mp(minx,maxy),
          mp(maxx,miny),mp(maxx,maxy),
        };
        ok=false;
        rep(k,4){
          bool tok=false;
          if(p[k]==app[i].F || p[k]==app[j].F) continue;
          rep(l,SZ(app)){
            if(app[l]==app[i] || app[l]==app[j]) continue;
            tok|=inr(app[i].F.F,app[i].F.S,p[k].F,p[k].S,app[l].F.F,app[l].F.S);
            tok|=inr(app[j].F.F,app[j].F.S,p[k].F,p[k].S,app[l].F.F,app[l].F.S);
          }
          if(tok) continue;
          ok=true;
          break;
        }
      }
      
      if(!ok){
        ne.pb(app[i]);
        ne.pb(app[j]);
      }else{
        end=false;
        ++ans;
      }
    }
    if(end) break;
    app=ne;
  }
  

  cout << ans*2 << endl;
  return 0;
}

Measured memory_bytes: 1488