#include<iostream>

using namespace std;

int a,b,i;

int main()
{
    do
    {
        cout<<"a= ";cin>>a;
        cout<<"b= ";cin>>b;
        if(a%2==1)
            a++;
        for(i=a; i<=b; i=i+2)
        {
            cout<<i<<" ";
        }
        cout<<endl;
    }while(a<=b);
    return 0;
}