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#include <bits/stdc++.h>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int n,a[100100],v[100100],k,poz[100100],m,s[100100],up[100100],p,Max;
void afis(int p)
{
if(p==poz[p]) {
out<<a[p]<<" ";
return;
}
else
{
afis(poz[p]);
out<<a[p]<<" ";
}
}
int main()
{
in>>n;
for(int i=1;i<=n;i++) in>>a[i];
for(int i=1;i<=n;i++)
{
if(k==0) v[++k]=a[i],s[k]=1,poz[k]=1,up[k]=1;
else
{
int st=1;
int dr=k;
p=0;
while(st<=dr)
{
m=(st+dr)/2;
if(v[m]<a[i]) {
dr=m-1;
p=m;
}
else st=m+1;
}
if(p) v[p]=a[i],s[p]++,poz[i]=up[p],up[p]=i;
else v[++k]=a[i],s[k]=1,poz[i]=i,up[k]=i;
}
}
for(int i=1;i<=k;i++) if(s[i]>Max) Max=s[i],p=up[i];
out<<Max<<'\n';
afis(p);
return 0;
}