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#include <cstdio>
using namespace std;
int v[100005],vmin[100005],m,pred[100005],pmin[100005],n;
void afisare(int i)
{
if(!i)
return;
afisare(pred[i]);
printf("%d ",v[i]);
return;
}
int caut(int x)
{
int r=0,pas=1<<17;
while(pas)
{
if(r+pas<=m&&v[pmin[r+pas]]<x)
r+=pas;
pas/=2;
}
return r;
}
int main()
{
freopen("scmax.in","r",stdin);
freopen("scmax.out","w",stdout);
int i,j;
scanf("%d",&n);
for(i=1;i<=n;i++)
scanf("%d",&v[i]);
m=0;
for(i=1;i<=n;i++)
{
j=caut(v[i]);
vmin[j+1]=v[i];
pmin[j+1]=i;
if(j==m)
m++;
pred[i]=pmin[j];
}
printf("%d\n",m);
afisare(pmin[m]);
}