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#include <fstream>
#define NM 100003
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,i,lmax,p,j,max1,k,st,dr,mijl;
int a[NM],l[NM],r[NM],poz[NM];
int main()
{
f>>n;
for(i=1;i<=n;i++) {
f>>a[i];
st=1; dr=lmax;
while(st<=dr){
mijl=(st+dr)/2;
if(a[r[mijl]]<a[i]) st=mijl+1;
else dr=mijl-1;
}
r[st]=i;
poz[i]=r[st-1];
if(st>lmax) lmax=st;
}
g<<lmax<<'\n';
k=r[lmax];
for(i=1;i<=lmax;i++){ r[i]=a[k];
k=poz[k];
}
for(i=lmax;i>=1;i--) g<<r[i]<<' ';
return 0;
}