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#include <bits/stdc++.h>
using namespace std;
multiset<int> M;
multiset<int>:: iterator it;
int N;
int main() {
freopen("scmax.in", "r", stdin);
freopen("scmax.out", "w", stdout);
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int i, x;
cin >> N;
for(int i = 1; i <= N; i++)
{
cin >> x;
M.insert(x);
it = M.lower_bound(x);
++it;
if(it != M.end()) M.erase(it);
}
cout << M.size() << '\n';
for(auto value : M) cout << value << ' ';
return 0;
}