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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],val[N],poz[N],pred[N],m,j;
int cautb(int x)
{
int r=0,pas=1<<16;
while(pas!=0){
if(r+pas<=m && v[poz[r+pas]]<x)
r+=pas;
pas/=2;
}
return r;
}
void subsir(int p)
{
if(pred[p]!=0)
subsir(pred[p]);
g<<v[p]<<' ';
}
int main()
{
f>>n;
for(int i=1;i<=n;i++){
f>>v[i];
j=cautb(v[i]);
if(j==m)
m++;
pred[i]=poz[j];
poz[j+1]=i;
}
g<<m<<'\n';
subsir(poz[m]);
return 0;
}