#include <bits/stdc++.h>
                                        #include<iostream>
                                        #include<cstdio>
                                        #include<vector>
                                        #include<queue>
                                        #include<map>
                                        #include<cstring>
                                        #include<string>
                                        #include <math.h>
                                        #include<algorithm>
                                    //    #include <boost/multiprecision/cpp_int.hpp>
                                        #include<functional>
                                #define int long long
                                        #define inf  1000000007
                                        #define pa pair<int,int>
                                        #define ll long long
                                        #define pal pair<double,pa>
                                        #define ppa pair<string,int>
                                        #define ppap pair<int,pa>
                                        #define ssa pair<string,int>
                                        #define  mp make_pair
                                        #define  pb push_back
                                        #define EPS (1e-12)
                                        #define equals(a,b) (fabs((a)-(b))<EPS)
                                  #define VI vector<int>
                                        using namespace std;
                                        
                                  class pas{
                                    	public:
                                    	int x,y;
                                    	pas(int x=0,int y=0):x(x),y(y) {}
                                    	pas operator + (pas p) {return pas(x+p.x,y+p.y);}
                                    	pas operator - (pas p) {return pas(x-p.x,y-p.y);}
                                    	pas operator * (int a) {return pas(x*a,y*a);}
                                    	pas operator / (int a) {return pas(x/a,y/a);}
                                    //	double absv() {return sqrt(norm());}
                                    	int norm() {return x*x+y*y;}
                                    	bool operator < (const pas &p) const{
                                   		return x != p.x ? x<p.x: y<p.y;
                                   	}
                                  //		bool operator < (const pas &p) const{
                                    //		return y != p.y ? y<p.y: x<p.x;
                                    //	}
                                    	bool operator == (const pas &p) const{
                                    		return x==p.x && y==p.y;
                                    	}
                                    };

                                        class Point{
                                        	public:
                                        	double x,y;
                                        	Point(double x=0,double y=0):x(x),y(y) {}
                                        	Point operator + (Point p) {return Point(x+p.x,y+p.y);}
                                        	Point operator - (Point p) {return Point(x-p.x,y-p.y);}
                                        	Point operator * (double a) {return Point(x*a,y*a);}
                                        	Point operator / (double a) {return Point(x/a,y/a);}
                                        	double absv() {return sqrt(norm());}
                                        	double norm() {return x*x+y*y;}
                                        	bool operator < (const Point &p) const{
                                        		return x != p.x ? x<p.x: y<p.y;
                                        	}
                                        	bool operator == (const Point &p) const{
                                        		return fabs(x-p.x)<EPS && fabs(y-p.y)<EPS;
                                        	}
                                        };
                                        typedef Point Vector;
                                 #define pl pair<int,pas>
                                        struct Segment{
                                        Point p1,p2;
                                        };
                                        
struct star{
Segment se[5];
};
                                         double dot(Vector a,Vector b){
                                        	return a.x*b.x+a.y*b.y;
                                        }
                                        double cross(Vector a,Vector b){
                                        	return a.x*b.y-a.y*b.x;
                                        }
                                    
            bool parareru(Point a,Point b,Point c,Point d){
            //	if(abs(cross(a-b,d-c))<EPS)cout<<"dd "<<cross(a-b,d-c)<<endl;
            	return abs(cross(a-b,d-c))<EPS;
            }
            double distance_ls_p(Point a, Point b, Point c) {
              if ( dot(b-a, c-a) < EPS ) return (c-a).absv();
              if ( dot(a-b, c-b) < EPS ) return (c-b).absv();
              return abs(cross(b-a, c-a)) / (b-a).absv();
            }
            bool is_intersected_ls(Segment a,Segment b) {
            	if(a.p1==b.p1||a.p2==b.p1||a.p1==b.p2||a.p2==b.p2) return false;
            	if(parareru((a.p2),(a.p1),(b.p1),(b.p2))&&parareru((a.p2),(a.p1),(b.p1),(b.p1))){
            //		cout<<"sss"<<endl;
            		if(dot(a.p1-b.p1,a.p1-b.p2)<EPS) return true;
            		if(dot(a.p2-b.p1,a.p2-b.p2)<EPS) return true;
            		if(dot(a.p1-b.p1,a.p2-b.p1)<EPS) return true;
            		if(dot(a.p1-b.p2,a.p2-b.p2)<EPS) return true;
            		return false;
            	}
              else return ( cross(a.p2-a.p1, b.p1-a.p1) * cross(a.p2-a.p1, b.p2-a.p1) < EPS ) && ( cross(b.p2-b.p1, a.p1-b.p1) * cross(b.p2-b.p1, a.p2-b.p1) < EPS );
            }
            double segment_len(Segment a){
            	
            	return (a.p1-a.p2).absv();
            }
            double segment_dis(Segment a,Segment b){
            	if(is_intersected_ls(a,b))return 0;
            	double r=distance_ls_p(a.p1, a.p2, b.p1);
            	r=min(r,distance_ls_p(a.p1, a.p2, b.p2));
            	r=min(r,distance_ls_p(b.p1, b.p2, a.p2));
            	r=min(r,distance_ls_p(b.p1, b.p2, a.p1));
            	return r;
            }
            Point intersection_ls(Segment a, Segment b) {
              Point ba = b.p2-b.p1;
              double d1 = abs(cross(ba, a.p1-b.p1));
              double d2 = abs(cross(ba, a.p2-b.p1));
              double t = d1 / (d1 + d2);
             
              return a.p1 + (a.p2-a.p1) * t;
            }
			pair<Point,Point> circle_intersection(Point c1,double r1,Point c2,double r2){
				double d=(c1-c2).absv();
				double h=(r1*r1-r2*r2+d*d)/2.0/d;
				double l=sqrt(r1*r1-h*h);
			//	cout<<d<<" "<<h<<" "<<l<<endl;
				Point asi=c1+(c2-c1)*h/((c2-c1).absv());
				Vector r1r2=(c2-c1)/((c2-c1).absv());
				Vector sui={r1r2.y,-r1r2.x};
			//	cout<<sui.x<<" "<<sui.y<<endl;
				pair<Point,Point> z=mp(asi+sui*l,asi-sui*l);
				if(z.first.x>z.second.x) swap(z.first,z.second);
				return z;
			}

int gcd(int x,int y){
	if(x<y) return gcd(y,x);
	if(x==y) return x;
	if(x%y==0) return y;
	return gcd(y,x%y);
}
 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 x != p.x ? x<p.x: y<p.y;
                                            }
										 	 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);
                                            }
                                                 
                                         
                                        };

/*　　　---memo---
add_edge(始点,終点,youryou ,コスト)で枝追加
min_cost_flow(始点,終点,ryou)でhiyouをintで返す
*/
int a[600][600]={0};
vector<pa> ve[30],ve2[30];

bool ch(pa r1,pa r2){
	if(r1.first==r2.first){
		if(abs(r1.second-r2.second)==1) return false;
		int r3=min(r1.second,r2.second),r4=max(r1.second,r2.second);
		bool bo=true;
		for(int k=r3+1;k<r4;k++)if(a[r1.first][k]>=0) return false;
		
		return true;
	}
	
	if(r1.second==r2.second){
	//	cout<<"e"<<endl;
		if(abs(r1.first-r2.first)==1) return false;
		int r3=min(r1.first,r2.first),r4=max(r1.first,r2.first);
		bool bo=true;
		for(int k=r3+1;k<r4;k++)if(a[k][r1.second]>=0) return false;
		
		return true;
	}
	
	if(r1.second>r2.second) swap(r1,r2);
	if(r2.first>r1.first){
		bool bo=true;
		
		for(int k=r1.second+1;k<=r2.second;k++)if(a[r1.first][k]>=0) bo=false;
		for(int k=r1.first;k<r2.first;k++)if(a[k][r2.second]>=0)bo=false;
		if(bo) return true;
		bo=true;
		
		for(int k=r1.second;k<r2.second;k++)if(a[r2.first][k]>=0) bo=false;
		for(int k=r1.first+1;k<=r2.first;k++)if(a[k][r1.second]>=0)bo=false;
		if(bo) return true;
		return false;
	}
	else{
		bool bo=true;
		
		for(int k=r1.first-1;k>=r2.first;k--)if(a[k][r1.second]>=0) bo=false;
		for(int k=r1.second;k<r2.second;k++)if(a[r2.first][k]>=0)bo=false;
		if(bo) return true;
		bo=true;
		
		for(int k=r1.second+1;k<=r2.second;k++)if(a[r1.first][k]>=0) bo=false;
		for(int k=r2.first+1;k<=r1.first;k++)if(a[k][r2.second]>=0)bo=false;
		if(bo) return true;
		return false;
		
	}
}


     signed main(){
int h,w;
     	cin>>h>>w;
     	for(int i=0;i<600;i++)for(int j=0;j<600;j++)a[i][j]=-1;
     	
     	for(int i=0;i<h;i++){
     		string s;
     		cin>>s;
     		for(int j=0;j<w;j++){
     			if(s[j]=='.') continue;
     			a[i][j]=1;
     			ve[s[j]-'A'].pb(mp(i,j));
     		}
     	}
     	int ans=0;
     //		cout<<"r"<<endl;
     	for(int i=0;i<26;i++){
     		if(ve[i].size()==0) continue;
     		
     		
     		
     		
     	}
     //	cout<<"r"<<endl;
     	for(int cn=0;cn<=100;cn++){
     		for(int i=0;i<26;i++)if(ve[i].size()>0){
     			if(ch(ve[i][0],ve[i][1])){
     			ans++;
     //				cout<<i<<endl;
     				a[ve[i][0].first][ve[i][0].second]=-1;
     				a[ve[i][1].first][ve[i][1].second]=-1;
     				ve[i].clear();
     				
     			//	for(int k=0;k<h;k++){
     			//		for(int l=0;l<w;l++)cout<<a[k][l]<<" ";
     			//		cout<<endl;
     			//	}
     			
     			}
     		
     		
     		}
     	}
     	cout<<2*ans<<endl;

    
           	return 0;
           }


Measured memory_bytes: 6008