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#include <bits/stdc++.h>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int a[100005], v[100005];
int main()
{
int n;
f >> n;
for(int i=1; i<=n; i++)
f >> a[i];
int nrmax=0, maxi;
for(int i=n; i>=1; i--)
{
maxi=0;
for(int j=i+1; j<=n; j++)
{
if(a[j]>a[i]&&v[j]>maxi)
{
maxi=v[j];
}
}
v[i]=maxi+1;
if(v[i]>nrmax)
nrmax=v[i];
}
g << nrmax << '\n';
for(int i=1; i<=n; i++)
{
if(v[i]==nrmax)
g << a[i] << " ", nrmax--;
}
return 0;
}