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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int v[100001], n, imax, l[100001], pred[100001];
void afis(int i)
{
if(pred[i])
afis(pred[i]);
out<<v[i]<<' ';
}
int main()
{
in>>n;
for(int i=1; i<=n; i++)
in>>v[i];
for(int i=1; i<=n; i++)
{
for(int j=1; j<i; j++)
if(v[j] < v[i] && l[j] > l[i])
{
l[i] = l[j];
pred[i] = j;
}
l[i]++;
if(l[i] > l[imax])
{
imax = i;
}
}
out<<l[imax]<<'\n';
afis(imax);
return 0;
}