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#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int a[100005],i,j,n,c[100005],p,t;
int caut_bin(int x,int dr)
{
int st=1,mij;
while(st<=dr)
{
mij=(st+dr)/2;
if(x<=c[mij]) dr=mij-1;
else st=mij+1;
}
return dr+1;
}
int main()
{
f>>n;
for(i=1; i<=n; i++) f>>a[i];
c[1]=a[1];
t=1;
for(i=2; i<=n; i++)
{
p=caut_bin(a[i],t);
if(p>t)
{
t++;
c[t]=a[i];
}
else if(a[i]<c[p]) c[p]=a[i];
}
g<<t<<'\n';
for(i=1;i<=t;i++) g<<c[i]<<" ";
return 0;
}