#include <bits/stdc++.h>
using namespace std;
int main() {
int n,m,c=0,l=0,z=0,s=0,t=0;
cin>>n>>m;
vector<vector<char>>v(n,vector<char>(m));
for (int i = 0; i < n; ++i)
for (int j = 0; j < m; ++j)
cin >> v[i][j];
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
if(v[i][j]!='.'){
if(i+1<n && j+1<m){
if(v[i][j]==v[i+1][j] && v[i][j]==v[i][j+1] && v[i][j]==v[i+1][j+1]){
c++;
v[i+1][j]='.';
v[i][j]='.';
v[i][j+1]='.';
v[i+1][j+1]='.';
}
}
}
}
}
cout<<c<<endl;
}
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