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#include <iostream>
#include<fstream>
using namespace std;
ifstream r("scmax.in");
ofstream w("scmax.out");
int v[200001],poz[200001],dinamica[200001],cnt[200001];
int cautbin(int x, int dr)
{
int st=1, p=0, mij;
while(st<=dr)
{
mij=(st+dr)/2;
if(v[poz[mij]]<x)
{
p=mij;
st=mij+1;
}
else
dr=mij-1;
}
return p;
}
int main()
{
int n=0, b=0, lungime=0, maxim=0, maxim2;
r>>n;
for(int i=0; i<n; i++)
{
r>>v[i];
}
for(int i=0; i<n; i++)
{
b=cautbin(v[i],lungime);
lungime=max(lungime,b+1);
dinamica[i]=b+1;
poz[dinamica[i]]=i;
maxim=max(maxim,dinamica[i]);
}
maxim2=maxim;
w<<maxim<<"\n";
for(int i=n-1; i>=0; i--)
{
if(maxim2==dinamica[i])
{
cnt[maxim2]=v[i];
maxim2--;
}
}
for(int i=1; i<=maxim; i++)
{
w<<cnt[i]<<" ";
}
return 0;
}