#include <fstream>
#include <algorithm>
#include <vector>

#define In "scmax.in"
#define Out "scmax.out"
#define Nmax 100002
#define Lim 50000
#define f(x) ((x)&(-(x)))
#define Next (++pos==Lim)?(in.read(Buffer,Lim),pos = 0):0

using namespace std;

int  N, dp[Nmax], Last[Nmax], a[Nmax], v[Nmax], A[Nmax], sol, pos;
char Buffer[Lim];

class Aib
{
    public:
    inline void Update(const int poz,const int val)
    {
        for(int i = poz;i <= N;i += f(i))
            aib[i] = dp[aib[i]] < dp[val]? val: aib[i];
    }
    inline int Query(const int x)
    {
        int i, ret = 0;
        for(i = x; i; i-= f(i))
            ret = dp[aib[i]] < dp[ret]? ret: aib[i];
        return ret;
    }
    private :int aib[Nmax];
};
Aib AIB;

ifstream in(In);

inline void Read(int &x)
{
    while(Buffer[pos]<'0' || '9'<Buffer[pos])
        Next;
    x = 0;
    while('0'<=Buffer[pos] && Buffer[pos]<='9')
    {
        x = x*10 +Buffer[pos]-'0';
        Next;
    }
}


inline void Read()
{
    in.read(Buffer,Lim);
    for(int i = 1;i <= N;++i)
    {
        Read(A[i]);
        a[i] = A[i];
    }
    in.close();
}
inline void Normalization()
{
    int i;
    sort(A+1,A+N+1);
    for(i = 1;i <= N; ++i)
        v[i] = upper_bound(A+1,A+N+1,a[i])-A-1;
}

inline void Solve()
{
    int i, j;
    for(i=1;i<=N;++i)
    {
        j = AIB.Query(v[i]-1);
        dp[i] = 1+dp[j];
        Last[i] = j;
        AIB.Update(v[i],i);
        if(dp[i]>dp[sol])
            sol = i;
    }
}
ofstream out(Out);

inline void Write(const int sol)
{
    if(sol)
    {
        Write(Last[sol]);
        out<<a[sol]<<" ";
    }
}

inline void Write()
{
    out<<a[sol]<<"\n";
    Write(sol);
    out<<"\n";
    out.close();
}

int main()
{
    Read();
    Normalization();
    Solve();
    Write();
    return 0;
}