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#include<iostream>
#include<fstream>
#include<vector>
#include<math.h>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int a[100005],b[100005],n,i,j,k,m;
void scriu(int j,int m)
{
if(m==1&&b[j]==1)g<<a[j]<<' ';
else
if(b[j]==m){scriu(j-1,m-1);g<<a[j]<<' ';}
else
scriu(j-1,m);
}
int main()
{
f>>n;
for(i=1;i<=n;i++)f>>a[i];
b[1]=1;
m=0;
for(i=2;i<=n;i++)
{
k=0;
for(j=1;j<i;j++)
if(a[j]<a[i])if(b[j]>k)k=b[j];
b[i]=k+1;
if(b[i]>m)m=b[i];
}
g<<m<<'\n';
scriu(n,m);
g.close();
return 0;
}