#include <vector>
#include <cstdlib>
#include <fstream>
#include <iterator>

/*
 *
 */
using namespace std;
vector< int > v, TopMax, p;
int main( void )
{
	int N, i, left, right, middle;
	ifstream in( "scmax.in" );
	in>>N;
	p.resize( N );
	copy( istream_iterator<int>( in ), istream_iterator<int>(), back_inserter(v) );
	TopMax.push_back(0);
	for( i=1; i < N; ++i )
	{
		if( v[i] > v[TopMax.back()] )
		{
			p[i]=TopMax.back();
			TopMax.push_back(i);
			continue;
		}
		left=0; right=TopMax.size()-1;
		while( left < right )
		{
			middle=left+(right-left)/2;
			if( v[i] >= v[TopMax[middle]] )
				left=middle+1;
			else right=middle;
		}
		if(  v[TopMax[left]] > v[i] )
		{
			if( left > 1 )
				p[i]=TopMax[left-1];
			TopMax[left]=i;
		}
	}
	for( N=TopMax.size(), i=TopMax.back(); N--; i=p[i] )
		TopMax[N]=v[i];
	ofstream out( "scmax.out" );
	out<<TopMax.size()<<'\n';
	copy( TopMax.begin(), TopMax.end(), ostream_iterator<int>( out, " " ) );
	out<<'\n';
	return EXIT_SUCCESS;
}