#include<iostream>
#include<stdio.h>

using namespace std;
int t[100001], l[100001],v[100001] ,bien, poz, n;

int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    int i,j,len = 0;
    scanf("%d",&n);
    for( i=1; i<=n; i++ )
        scanf("%d",&v[i]);
    t[0] = v[1]; len++;
    for( i=2; i<=n; i++ )
    {
       bool ok = true;
       for( j=0; j<len && ok ; j++ )
            if(v[i]<=t[j])
                {
                   ok = false;
                   t[j] = v[i];
                }
       if( ok )
           t[len++] = v[i];
    }
    cout<<len<<"\n";
    for( i=0; i<len; i++ )
        printf("%d ",t[i]);
    printf("\n");
    return 0;
}