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#include <fstream>
#include <algorithm>
using namespace std;
int maxim, i, v[5005], y[5005], ap[5005], m, l, lmin, n, j;
int main()
{
ifstream fin("secv.in");
ofstream fout("secv.out");
fin>>n;
lmin=1000000;
for(i=1; i<=n; i++)
fin>>v[i],y[i]=v[i];
sort(y+1,y+n+1);
y[0]=-1;
for(i=1; i<=n; i++)
if(y[i]!=y[i-1])
ap[++m]=y[i];
for(i=1; i<=n; i++)
if(v[i]==ap[1])
{
l=1;
for(j=i+1; j<=n; j++)
{
if(v[j]==ap[l+1])
l++;
if(m==l)
if(j-i+1<lmin)
{
lmin=j-i+1;
break;
}
}
}
if(lmin==1000000)
fout<<-1;
else
fout<<lmin;
return 0;
}