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#include <bits/stdc++.h>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,i,nr,j,p,mij,u,poz,d[100100],v[100100];
int main()
{
f>>n;
for(i=1;i<=n;i++)
{
f>>v[i];
d[i]=INT_MAX;
}
for(i=1;i<=n;i++)
{
nr=v[i];
p=1;u=n;
poz=-1;
while(p<=u)
{
mij=(p+u)/2;
if(d[mij]>nr){poz=mij;u=mij-1;}
else p=mij+1;
}
if(d[poz]>nr && d[poz-1]<nr)d[poz]=nr;
}
nr=0;
for(i=n;i>=1;i--)
{
if(d[i]!=INT_MAX)nr++;
}
g<<nr<<'\n';
for(i=1;i<=nr;i++)g<<d[i]<<" ";
return 0;
}