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#include<fstream>
#include<algorithm>
using namespace std;
ifstream f("secv.in");
ofstream g("secv.out");
int n,i,j,t,min1,k,ok;
int v[5001],w[5001];
int main()
{
f>>n;
for(i=1;i<=n;i++)
{
f>>v[i];
w[i]=v[i];
}
w[0]=2000000000;
sort(w+1,w+n+1);
t=1;
for(i=2;i<=n;i++)
if(w[i]!=w[i-1])
w[++t]=w[i];
min1=2000000000;
for(i=1;i<=n-t+1;i++)
{
k=1;
ok=0;
for(j=i;j<=n;j++)
{
if(v[j]==w[k])
{
k++;
if(k>t)
{
ok=1;
break;
}
}
}
if(ok==1)
{
if(min1>j-i+1)
min1=j-i+1;
}
}
if(min1==2000000000)
g<<-1;
else
g<<min1;
return 0;
}