This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
template<typename T>
istream &operator>>(istream &is, vector<T> &v) {
for (auto &x : v) is >> x;
return is;
}
int main() {
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int n, m; cin >> n >> m;
vector<vector<char>> a(n, vector<char>(m)); cin >> a;
int ans = 0;
for (int i = 0; i < n; i++) {
if (i != n - 1 && a[i][0] == 'X') {
cout << "-1\n";
return 0;
}
ans++;
}
cout << ans - 1 << '\n';
}
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