#include <fstream>
#include <iostream>
using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int v[100005], dp[100005], pre[100005], n, maxim, index;

void afisSubsir(int n) {
    if(pre[n])
        afisSubsir(pre[n]);
    g << v[n] << ' ';
}

void afisDp() {
    for(int i = 1; i <= n; i++)
        if(dp[i])
            cout << dp[i] << ' ' << i << ' ';
    cout << '\n';

}

int main() {
    f >> n;
    for(int i = 1; i <= n; i++)
        f >> v[i];

    for(int i = 1; i <= n; i++) {
        dp[i] = 1;
        for(int j = 1; j < i; j++)
            if(v[j] < v[i] && dp[j]+1 > dp[i]) {
                dp[i] = dp[j]+1;
                pre[i] = j;
            }
        if(dp[i] > maxim) {
            maxim = dp[i];
            index = i;
        }
    }

    g << dp[index] << '\n';
    afisSubsir(index);
}