UVa 10650

#include <bits/stdc++.h>
using namespace std;

#define read()             freopen("input.txt", "r", stdin)
#define write()            freopen("output.txt", "w", stdout)

vector<int>primes;
vector< vector< int > > v;
bool chk[100000];
int setcnt[100000];

void seive()
{
    chk[0]=true;
    chk[1]=true;
    for(int i=2;i<50000;i++){
        if(chk[i]) continue;
        primes.push_back(i);
        for(int j=2;i*j<50000;j++){
            chk[i*j]=true;
        }
    }
}

void sets()
{
    vector<int>h;
    v.push_back(h);
    int cnt=1,k=0,i=0,x;
    while(i<primes.size()-100){
        if(primes[i+1]-primes[i]==primes[i+2]-primes[i+1]){
            x = primes[i];
            while(k<=x){
                setcnt[k++]=cnt;
            }
            vector<int>temp;
            temp.push_back(primes[i]);
            temp.push_back(primes[i+1]);
            temp.push_back(primes[i+2]);
            i+=3;
            while(primes[i]-primes[i-1]==primes[i-1]-primes[i-2]){
                temp.push_back(primes[i]);
                i++;
            }
            i--;
            x = primes[i];
            while(k<x){
                setcnt[k++]=-cnt;
            }
            cnt++;
            v.push_back(temp);
        }
        else{
            i++;
        }
    }
}

int main()
{
    //read();
    //write();
    seive();
    sets();
    int x,y;
    while(cin>>x>>y){
        if(x==0 && y==0) break;
        if(x>y) swap(x,y);
        x = setcnt[x];
        y = setcnt[y];
        if(x<0){
            x=-x;
            x++;
        }
        if(y<0) y=-y;
        for(int i=x;i<y;i++){
            for(int j=0;j<v[i].size();j++){
                if(j) cout<<' ';
                cout<<v[i][j];
            }
            cout<<'\n';
        }
    }
    return 0;
}