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#include <iostream>
#include <fstream>
using namespace std;
#define MAXN 100010
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,tata[MAXN],w[MAXN],v[MAXN],nr,maxim,k,drum[MAXN];
int main()
{
f>>n;
for(int i=1; i<=n; i++)
f>>v[i];
w[1]=1;
for(int i=2; i<=n; i++)
{
for(int j=1; j<i; j++)
{
if(v[i]>v[j])
{
if(w[j]>w[i])
{
w[i]=w[j];
tata[i]=j;
}
}
}
w[i]++;
if(w[i]>maxim)
{
maxim=w[i];
nr=i;
}
}
g<<maxim<<'\n';
while(nr)
{
drum[++k]=v[nr];
nr=tata[nr];
}
for(int i=maxim;i>=1;i--)
g<<drum[i]<<' ';
return 0;
}