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 all(x) x.begin(),x.end()
#define ll long long 
#define LCBorz ios_base::sync_with_stdio(false);cin.tie(0);
const int N=1000005;
const int mod=1e6+3;
int32_t main(){
    LCBorz;
    int n;cin>>n;
    vector<int> v(n+1);
    for(int i=1;i<=n;i++){
        cin>>v[i];
    }
    int last=-1;
    for(int i=0;i<n;i++){
        if(v[i]<last){
            cout<<-1<<endl;
            return 0;
        }
        last=v[i];
    }
    cout<<0<<endl;
    
    return 0;
}
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