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#include <bits/stdc++.h>
using namespace std;
ifstream fin("secv.in");
ofstream fout("secv.out");
int v[5001],no[5001],d[5001];
int n,lg,Min=5001,i,k,j;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
{
fin>>v[i];
no[i]=v[i];
}
sort(no+1,no+n+1);
no[0]=-1;
for(i=1;i<=n;i++)
if(no[i]!=no[i-1])
no[++k]=no[i];
for(i=1;i<=n;i++)
if(v[i]==no[1])
{
lg=1;
for(j=i+1; j<=n; j++)
{
if(v[j]==no[lg+1])
lg++;
if(lg==k)
if(j-i+1<Min)
{
Min=j-i+1;
break;
}
}
}
if(k==1)
fout<<1<<' ';
else if(Min==5001)
fout<<-1<<'\n';
else
fout<<Min<<'\n';
return 0;
}