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#include <fstream>
using namespace std;
ifstream f ("scmax.in");
ofstream g ("scmax.out");
int i,j,maxi,k,poz,n,x[100001],v[100001],l[100001],sol[100001];
int main()
{ f>>n;
for(i=1;i<=n;i++)
x[i]=-1;
maxi=1;
for(i=1;i<=n;i++){
f>>v[i];
l[i]=1;
for(j=i-1;j>=1;j--){
if(v[i]>v[j]&&l[i]<l[j]+1){
l[i]=l[j]+1;
x[i]=j;
}
}
if(maxi<l[i]){
maxi=l[i];
poz=i;
}
}
g<<maxi<<'\n';
k=0;
while(poz>0){
sol[++k]=v[poz];
poz=x[poz];
}
for(i=k;i>=1;i--)
g<<sol[i]<<' ';
return 0;
}