#include<bits/stdc++.h>
using namespace std;
int main(){
int n,m,ans=0;
bool possible=true;
cin>>n>>m;
vector<vector<char>>v(n+5,vector<char>(m+5));
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
cin>>v[i][j];
if(i==n-1 && j==m-1){
continue;
}
if(v[i][j]=='X'){
possible=false;
}
if(v[i][j]=='E'){
ans+=3;
}
}
}
if(possible==false){
return cout<<-1,0;
}
cout<<ans;
}
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