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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
const int N=100001;
int n,v[N],s[N],r[N],cnt,mm;
int main()
{
f>>n;
for(int i=1;i<=n;i++){
f>>v[i];
int maxim=0;
for(int j=1;j<i;j++)
if(v[j]<v[i])
maxim=max(maxim,s[j]);
s[i]=maxim+1;
if(s[i]>mm)
mm=s[i];
}
for(int i=n;i>=1;i--){
if(s[i]==mm){
r[++cnt]=v[i];
mm--;
}
}
g<<cnt<<'\n';
for(int i=cnt;i>=1;i--)
g<<r[i]<<' ';
return 0;
}