#include <bits/stdc++.h>
#define FI(_n) for(int i = 0;i<(_n);i++)
#define FJ(_n) for(int j = 0;j<(_n);j++)
using namespace std;
typedef long long ll;
int main()
{
    ios_base::sync_with_stdio(0);
//    ifstream cin("input.txt");
//    ofstream cout("output.txt");
    cin.tie(0);cout.tie(0);

    ll a,b;
    cin>>a>>b;

    ll l = 0, r = sqrtl(1ll*2*(a+b));
    while(l+1<r)
    {
        ll med = (l + r)>>1;
        ll i = med;
        ll bufa = a,bufb = b;
        while(1)
        {
            if(i==0) break;
            if(bufa<=bufb&&bufa>=i)
            {
                bufa-=i;
                i--;
            }
            else if(bufb>=i)
            {
                bufb-=i;
                i--;
            }
            else if(bufa>=i)
            {
                bufa-=i;
                i--;
            }
            else break;
        }
        if(i==0)
        {
            l = med;
        }
        else if(i<0) l = med + 1;
        else r = med - 1;
    }
    // check r
    ll i = r;
    vector<ll> ansa,ansb;
    ll bufa = a,bufb = b;
    while(1)
    {
        if(i==0) break;
        if(bufa<=bufb&&bufa>=i)
        {
            bufa-=i;
            ansa.push_back(i);
            i--;
        }
        else if(bufb>=i)
        {
            bufb-=i;
            ansb.push_back(i);
            i--;
        }
        else if(bufa>=i)
        {
            bufa-=i;
            ansa.push_back(i);
            i--;
        }
        else break;
    }
    if(i<=0)
    {
        cout<<ansa.size()<<"\n";
        FI(ansa.size()) cout<<ansa[i]<<" ";
        cout<<"\n"<<ansb.size()<<"\n";
        FI(ansb.size()) cout<<ansb[i]<<" ";
        return 0;
    }
    i = l;
    ansa.clear();
    ansb.clear();
    bufa = a;
    bufb = b;
    while(1)
    {
        if(i==0) break;
        if(bufa<=bufb&&bufa>=i)
        {
            bufa-=i;
            ansa.push_back(i);
            i--;
        }
        else if(bufb>=i)
        {
            bufb-=i;
            ansb.push_back(i);
            i--;
        }
        else if(bufa>=i)
        {
            bufa-=i;
            ansa.push_back(i);
            i--;
        }
        else break;
    }
    cout<<ansa.size()<<"\n";
    FI(ansa.size()) cout<<ansa[i]<<" ";
    cout<<"\n"<<ansb.size()<<"\n";
    FI(ansb.size()) cout<<ansb[i]<<" ";




//    cin.close();
//    cout.close();
    return 0;
}