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#include <bits/stdc++.h>
using namespace std;
int n,m,k,l,s,t,r;
string p;
int a[1005][1005];
int b[1005][1005];
int main()
{
    cin>>n>>m;
    if(n>m)
    {
        cout<<-1<<endl;
        return 0;
    }
    for(int i=1;i<=n;i++)
    {
        cin>>p;
        for(int j=0;j<m;j++)
            a[i][j+1]=p[j];
    }
    for(int i=0;i<=m;i++)
        b[0][i]=1,a[0][i]='O';
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
        {
            if(a[i][j]=='O'&&a[i-1][j-1]=='O'&&b[i-1][j-1]==1)
                b[i][j]=1;
            if(a[i][j]=='O'&&a[i][j-1]=='O'&&b[i][j-1]==1)
                b[i][j]=1;
        }
 
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