#include<stdio.h>
int i,j,n,v[100001],l[100001],max,x,sf,max1,sol[100010],rec[100010];
int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    scanf("%d",&n);
    for(i=1;i<=n;i++)
        scanf("%d",&v[i]);
    l[1]=1;
    for(i=2;i<=n;i++)
    {
        max=0;
        for(j=1;j<i;j++)
        {
            if(v[j]<v[i])
            {
                if(l[j]>max)
                max=l[j];
                sol[i]=j;
            }
        }

        l[i]=max+1;
        if(l[i]>max1)
        {
            max1=l[i];
            sf=i;
        }
    }
    printf("%d\n",max1);
    rec[max1]=v[sf];
    for(i=max1-1;i>=1;i--)
        {
            rec[i]=v[sol[sf]];
            sf=sol[sf];
        }
    for(i=1;i<=max1;i++)
        printf("%d ",rec[i]);
}