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#include <bits/stdc++.h>
#define Dim 100001
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int N,A[Dim],Q[Dim],P[Dim],lg,cnt,S[Dim],kop;
int main()
{
f>>N;
for(int i=1;i<=N;i++) f>>A[i];
Q[++lg]=A[1];
P[++cnt]=1;
for(int i=2;i<=N;i++)
{
int x=A[i];
int st=1,dr=lg,poz=-1;
while(st<=dr)
{
int mij=(st+dr)/2;
if( x > Q[mij] ) st=mij+1;
else
{
poz=mij;
dr=mij-1;
}
}
if( poz == -1 )
{
Q[++lg]=x;
P[++cnt]=lg;
}
else
{
Q[poz]=x;
P[++cnt]=poz;
}
}
g<<lg<<'\n';
for(int i=cnt;i>=1 && lg > 0 ;i--)
{
if(P[i]==lg)
{
lg--;
S[++kop]=i;
}
}
for(int i=kop;i>=1;i--)
g<<A[S[i]]<<' ';
return 0;
}