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