#include<bits/stdc++.h>
#define N 100010

using namespace std;


int s[N], p[N];
int n,a[N],k ;

void rec(int x) {
    if (!x) return;
    rec(p[x]);
    cout<<a[x]<<" ";
}

int main() {
    ifstream cin("scmax.in");
freopen("scamax.out", "w", stdout);

    cin>>n;
    for (int i=1; i<=n; i++) cin>>a[i];

    s[1]=k=1;
    for(int i=2; i<=n; i++) {
        int st=1,dr=k;
        while (st<=dr) {
            int mid=(st+dr)>>1;
            if (a[s[mid]]<a[i]) st=mid+1;
            else dr=mid-1;
        }
        if (st>k) k = st;
        s[st] = i;
        p[i] = s[st-1];
    }

    cout<<k<<'\n';
    rec(s[k]);

    return 0;
}