#include<cstdio>
int n,v[100001],m[100001],i,b[100001],saturat[100001],pr;
int fbin(int x,int y)
{
    int mid=(x+y)/2;
    if((v[i]<m[mid]||m[mid]==0)&&(v[i]>m[mid+1]||m[mid+1]==0)) return mid+1;
    if(v[i]>m[mid]&&mid-1>=x) return fbin(x,mid-1);
    if(v[i]<m[mid+1]&&mid+1<=y) return fbin(mid+1,y);
    return 0;
}
int main()
{
    int deg;
    freopen("scmax.in","rt",stdin);
    freopen("scmax.out","wt",stdout);
    scanf("%ld",&n);
    int maxim=1;
    for(i=1; i<=n; i++)
        scanf("%ld",&v[i]);
    for(i=n;i>=1;i--)
    {
        deg=fbin(1,maxim);
        m[deg]=v[i];
        saturat[deg]=i;
        if(deg>maxim) maxim=deg,pr=i;
        b[i]=saturat[deg-1];
    }
    printf("%ld\n",maxim-1);
    while(pr!=0)
        {
    printf("%ld ",v[pr]);
    pr=b[pr];}
}