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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int dp[100001],a[100001],s[100001];
int main()
{
int n,i,j,poz,maxx=0,maxnr=0;
fin>>n;
for(i=1;i<=n;i++)
{
fin>>a[i];
dp[i]=1;
for(j=1;j<i;j++)
if(a[j]<a[i] && dp[j]+1>dp[i])
{
dp[i]=dp[j]+1;
if(dp[i]>maxx)
{
maxx=dp[i];
poz=i;
}
}
}
fout<<maxx<<'\n';
int k=maxx;
s[k]=a[poz];
k--;
j=poz-1;
while(j>=1 && k!=0)
{
if(dp[j]==k && a[j]<s[k+1])
{
s[k]=a[j];
k--;
}
j--;
}
for(i=1;i<=maxx;i++)
fout<<s[i]<<" ";
return 0;
}