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#include <fstream>
#define lim 100000
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
long long v[lim+5], sol[lim+5], poz[lim+5], ans[lim+5];
long long n, st, dr, p, nrm, mij;
int main()
{
in>>n;
for(int i=1; i<=n; i++) in>>v[i];
nrm=1;
sol[1]=v[1];
poz[1]=1;
for(int i=2; i<=n; i++)
{
st=1; dr=nrm; p=-1;
while(st<=dr)
{
mij = (st+dr)/2;
if(sol[mij]<v[i]) st = mij+1;
else
{
p = mij;
dr=mij-1;
}
}
if(p==-1)
{
sol[++nrm]=v[i];
poz[i]=nrm;
}
else
{
sol[p]=v[i];
poz[i]=p;
}
}
for(int i=1; i<=n; i++)
if(poz[i]>ans[0]) ans[++ans[0]]=v[i];
else if(poz[i]==ans[0]) ans[ans[0]]=v[i];
out<<ans[0]<<'\n';
for(int i=1; i<=ans[0]; i++) out<<ans[i]<<' ';
return 0;
}