#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
using ll = long long;
ll n,m,i,j,a[100],res;
char ch;
int main()
{
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin>>n>>m;
a['N'] = 1;
a['E'] = 2;
a['S'] = 3;
a['W'] = 4;
a['X'] = 5;
for (i=1;i<=n;i++) for (j=1;j<=m;j++) {
cin>>ch;
if (ch=='X'&&j!=m) {cout<<-1;return 0;}
}
cout<<res;
return 0;
}
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