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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("secv.in");
ofstream fout("secv.out");
int n,i,j,a[50055],k,v[50055],sol,best=0x3f3f3f3f;
bool avem[2000000001];
int main()
{
fin>>n;
for(i=1;i<=n;i++)
{
fin>>a[i];
if(!avem[a[i]]){
++k;
v[k]=a[i];
avem[a[i]]=true;
}
}
sort(v+1,v+k+1);
for(i=1;i<=n;i++){
if(a[i]==v[1])
{
int indice=1;
for(j=i+1;j<=n+1;j++)
{
if(indice==k){
sol=j-i;
if(sol<best)
best=sol;
break;
}
if(a[j]==v[indice+1])
indice++;
}
}
}
if(best==0x3f3f3f3f)
fout<<-1;
else fout<<best;
return 0;
}