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#include <iostream>
#include <fstream>
#define NMAX 100005
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,i,j;
int v[NMAX],c[NMAX],MAX=0,sol[NMAX],poz;
int main(){
f>>n;
for(i=1;i<=n;i++)
f>>v[i];
c[n]=1;
for(i=n;i>=2;i--){
for(j=i;j<=n;j++)
if(v[i-1]<v[j]&&c[i-1]<c[j]+1){
c[i-1]=c[j]+1;
sol[i-1]=j;
}
}
MAX=0;
for(i=1;i<=n;i++){
if(MAX<c[i]){
MAX=c[i];
poz=i;
}
}
g<<MAX<<'\n';
for(i=1;i<=MAX;i++){
g<<v[poz]<<' ';
poz=sol[poz];
}
return 0;
}