[Link] https://www.acmicpc.net/problem/14002
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import java.util.*;
import java.io.*;
public class Main {
static BufferedReader br;
static int max = 0, maxIdx = 0;
public static void main(String[] args) throws IOException {
br = new BufferedReader(new InputStreamReader(System.in));
StringBuilder sb = new StringBuilder();
String[] line;
int n = toi(br.readLine());
line = getLine();
Info[] dp = new Info[n];
int max = 0, maxIdx = 0;
for(int i = 0; i < n; i++) {
int v = toi(line[i]);
dp[i] = new Info(v);
for(int j = 0; j < i; j++) {
if(v <= dp[j].val) continue;
if(dp[i].step < dp[j].step + 1) {
dp[i].step = dp[j].step + 1;
dp[i].from = j;
}
}
if(max < dp[i].step) {
max = dp[i].step;
maxIdx = i;
}
}
Stack<Integer> stack = new Stack<>();
while(true) {
stack.push(dp[maxIdx].val);
if(dp[maxIdx].from == -1) break;
maxIdx = dp[maxIdx].from;
}
sb.append(max).append("\n");
while(!stack.isEmpty()) sb.append(stack.pop()).append(" ");
print(sb);
}
static class Info {
int from = -1;
int val;
int step = 1;
Info(int val) { this.val = val; }
}
static int toi(String s) { return Integer.parseInt(s); }
static String[] getLine() throws IOException { return br.readLine().split(" "); }
static <T> void print(T s) { System.out.print(s); }
static <T> void println(T s) { System.out.println(s); }
}