#include <stdio.h>
#include <algorithm>
#include <vector> 
using namespace std;
 
#define MAXN 100001

int N, values[MAXN], V[MAXN]; 
int O[MAXN], B[MAXN], AIB[MAXN];
int best, P[MAXN];
 
void update(int x, int ind){	
	for (; x <= N; x += x^(x-1) & x)
		if (B[ind] > B[AIB[x]])
			AIB[x] = ind;
}
 
int query(int x){
	int mx = 0;
	for (; x; x -= x^(x-1) & x)
		if (B[AIB[x]] > B[mx])
			mx = AIB[x];
	return mx;
}
 
int main(void){
	int i, h = 1;
 
	freopen("scmax.in", "r", stdin);
	freopen("scmax.out", "w", stdout);
 
	scanf("%d", &N);
	for (int i = 1; i <= N; i++){
		scanf("%d", &V[i]);
		values[i] = V[i];
		O[i] = V[i];
	}
	
	// sortarea vectorului
	sort(O+1, O+N+1);
	
	for (i = 2; i <= N; ++i){
		if (O[i] != O[h])
			O[++h] = O[i];
	}

	for (i = 1; i <= N; ++i)
		V[i] = lower_bound(O+1, O+h+1, V[i]) - O;
	
	for (i = 1; i <= N; i++){
		P[i] = query(V[i]-1);
		B[i] = B[P[i]] + 1;
		update(V[i], i);
	}
	
	for (i = 1; i <= N; ++i){
		if (B[best] < B[i])
			best = i;
	}
	
	printf("%d\n", B[best]);

	i=best, h=B[best]-1;
	while(i>0){
		O[h]=values[i];
		i=P[i]; h--;
	}
 
	for(i=0;i<B[best];i++)
		printf("%d ", O[i]);	
	printf("\n");

	return 0;
}