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#include <fstream>
#include <vector>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,x,i,k,a[100005];
int cautbinar(int x){
int st=1,dr=k,sol=0;
while(st<=dr){
int mij=(st+dr)/2;
if(a[mij]>=x){
sol=mij;
dr=mij-1;
}
else
st=mij+1;
}
if(sol==0)
sol=++k;
return sol;
}
int main()
{
fin>>n;
for(i=1;i<=n;i++){
fin>>x;
int p=cautbinar(x);
a[p]=x;
}
fout<<k<<'\n';
for(i=1;i<=k;i++)
fout<<a[i]<<' ';
return 0;
}