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#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,nmax,k,i,st,dr,m;
int a[100005],dp[100005], t[100005];
int afis(int x)
{
if(x){
afis(t[x]);
fout<<a[x]<<' ';
}
}
int main()
{
fin>>n; for(i=1;i<=n;i++)fin>>a[i];
k=dp[1]=1;
for(i=2;i<=n;i++)
{
st=1;dr=k;m=0;
while(st<=dr) {
m=(st+dr)/2;
if(a[dp[m]]<a[i])st=m+1; else dr=m-1;
}
if(st>k) k++;
dp[st]=i;
t[i]=dp[st-1];
}
fout<<k<<'\n';
afis(dp[k]);
return 0;
}