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;
#define ll long long
#define f first
#define s second
#define pb push_back
#define pf push_front
#define pi pair<int,int>
const int MAX = 2e5+1;
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n,m;
cin >> n >> m;
ll cnt = 0;
char c;
for(int i = 1; i <= m;i++){
cin >> c;
if(c=='X')cnt++;
}
if(cnt>1) cout << -1<< endl;
else cout << 0 << endl;
}
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