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#include <bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,S[100001],sol,C[100001],A[100001],R[100001];
int main(){
fin>>n;
fin>>C[1];
S[1]=C[1];
R[1]=1;
sol=2;
for(int i=2;i<=n;i++){
fin>>C[i];
int ind=lower_bound(S,S+sol,C[i])-S;
if(ind<sol){
S[ind]=C[i];
R[i]=ind;
}else{
R[i]=sol;
S[sol++]=C[i];
}
}
fout<<--sol<<'\n';
int k=sol;
for(int i=n;i>=1;i--){
if(R[i]==sol && sol>0){
A[sol--]=C[i];
}
}
for(int i=1;i<=k;i++){
fout<<A[i]<<' ';
}
return 0;
}