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#include <bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
long long v[100001][2];
void afis(long long i,long long pas)
{
if(pas==1)fout<<v[i][0]<< ' ';
else
{
int z;
for(z=i-1; z>=1; z--)
{
if(v[z][1]==pas-1)
{
afis(z,pas-1);
break;
}
}
fout<<v[i][0]<< ' ';
}
}
int main()
{
long long j,i,n,l,smax=0,idx;
fin>>n;
for(i=1; i<=n; i++)
{
fin>>v[i][0];
v[i][1]=1;
for(j=i-1; j>=1; j--)
{
if(v[i][0]>v[j][0])
{
if(v[i][1]<=v[j][1])
v[i][1]=v[j][1]+1;
}
}
if(smax<v[i][1])smax=v[i][1];
idx=i;
}
fout<<smax<<'\n';
afis(idx,smax);
}