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 endl '\n'
#define ll long long
const ll sz=2e5+5, mod=1e9+7;
int main()
{
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
ll n, m;
cin>>n>>m;
ll ans=0;
for(int i=1; i<=m; i++){
char c;
cin>>c;
if(c=='X' && i<m){
ans=-1;
}
}
cout<<ans;
}
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