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#include<fstream>
#define MAXN 100001
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int l[MAXN], prev[MAXN], v[MAXN];
void print(int poz){
if(poz){
print(prev[poz]);
g<<v[poz]<<' ';
}
}
int main()
{ int n, i, lmax, rasp, p;
f>>n;
for(i=1; i<=n; i++)
f>>v[i];
l[1]=lmax=1;
for(i=2; i<=n; i++){
p=1<<17; rasp=0;
while(p){
if(rasp+p<=lmax && v[l[rasp+p]]<v[i])
rasp+=p;
p>>=1;
}
if(rasp==lmax)
++lmax;
prev[i]=l[rasp];
l[rasp+1]=i;
}
g<<lmax<<'\n';
print(l[lmax]);
g.close();
return 0;
}