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#include <bits/stdc++.h>
#define dim 100001
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,v[dim],m[dim],p[dim];
int st,dr,mij,k,poz;
void afis(int poz)
{
if(p[poz]!=0) afis(p[poz]);
g<<v[poz]<<" ";
}
int main()
{
f>>n;
for(int i=1;i<=n;i++)
f>>v[i];
m[1]=1;
for(int i=1;i<=n;i++){
st=1 , dr=k;
while(st<=dr){
mij=(st+dr)/2;
if(v[i]>v[m[mij]])
st=mij+1;
else
dr=mij-1;
}
m[st]=i;
p[i]=m[st-1];
if(st>k){
k++;
poz=i;
}
}
g<<k<<"\n";
afis(poz);
/*
g<<v[poz]<<" ";
while(p[poz]!=0)
{
g<<v[p[poz]]<<" ";
poz=p[poz];
}*/
return 0;
}