#include <bits/stdc++.h>
using namespace std;
int main()
{
int n, m; cin >> n >> m;
string s = "", t;
while (--n)
{
cin >> t;
s += t;
}
int ans = 0;
bool pos = true;
for (char c : s)
{
if (c == 'E') ans++;
else pos = false;;
}
cout << (pos ? ans : -1) << '\n';
return 0;
}
// int main()
// {
// int n, m, k; cin >> n >> m;
// vector<string> g(n);
// for (string &s : g) cin >> s;
// vector<vector<vector<int>>> dp(n, vector<vector<int>> (m, vector<int> (k)));
// }
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