#include<cstdio>
#include<string>
#include<algorithm>

using namespace std;

#ifdef HOME
const string inputFile = "input.txt";
const string outputFile = "output.txt";
#else
const string problemName = "scmax";
const string inputFile = problemName + ".in";
const string outputFile = problemName + ".out";
#endif

const int INF = (1 << 30);
const int NMAX = 100000 + 5;

int N, sol;
int A[NMAX];
int T[NMAX];
int S[NMAX];
int DP[NMAX];

int main() {
    int i, j, k;

    freopen(inputFile.c_str(), "r", stdin);
    freopen(outputFile.c_str(), "w", stdout);

    scanf("%d", &N);

    for(i = 1; i <= N; i++) {
        scanf("%d", &A[i]);
        T[i] = INF;
        j = lower_bound(T + 1, T + i + 1, A[i]) - T;
        T[j] = A[i];
        DP[i] = j;
        sol = max(sol, DP[i]);
    }

    for(i = N, j = INF, k = sol; i >= 1; i--)
        if(DP[i] == k && A[i] < j) {
            S[k] = A[i];
            j = A[i];
            k--;
        }

    printf("%d\n", sol);

    for(i = 1; i <= sol; i++)
        printf("%d ", S[i]);

    return 0;
}