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#include<fstream>
#include<algorithm>
#define MAXN 5002
using namespace std;
int v[MAXN],a[MAXN],b[MAXN];
int n,i,j,mini=5010,aux,k=1;
int main()
{
ifstream f("secv.in");
ofstream g("secv.out");
f>>n;
for(i=1;i<=n;i++)
{
f>>v[i];
a[i]=v[i];
}
sort(v+1,v+1+n);
b[1]=v[1];
for(i=2;i<=n;++i)
if(v[i]!=v[i-1])
b[++k]=v[i];
for(i=1;i<=n;++i)
{
if(a[i]==b[1])
{
aux=0;
for(j=i;j<=n;++j)
{
if(a[j]==b[aux+1])
++aux;
if(aux==k && j-i+1<=mini)
mini=j-i+1;
}
}
}
if(mini==5010)
mini=-1;
g<<mini;
return 0;
}