#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
const int dim = 100000 + 5;
int n, a[dim], dp[dim], pre[dim], sol[dim], k  = 0;
int main()
{
    int i, j;
    fin >> n;
    for ( i = 1; i <= n; ++i )
        fin >> a[i];
    int maxi;
    for ( i = 1; i <= n; ++i )
    {
        maxi = 0;
        for ( j = 1; j < i; ++j )
            if ( a[j] < a[i] && dp[j] > maxi )
            {
                maxi = dp[j];
                pre[i] = j;
            }
        dp[i] = maxi + 1;
    }
    maxi = 0;
    int poz;
    for ( i = 1; i <= n; ++i )
        if ( maxi < dp[i] )
        {
            maxi = dp[i];
            poz = i;
        }

    fout << maxi << '\n';
    while ( poz != 0 )
    {
        sol[++k] = a[poz];
        poz = pre[poz];
    }
    for ( i = k; i >= 1; --i )
        fout << sol[i] << " ";
    return 0;
}