#include<iostream>
using namespace std;
int a,b,x,nr0,nr1,y,c;
int main()
{cout<<"a=";cin>>a;
cout<<"b=";cin>>b;
for(x=b-1; x>a; --x)
{y=x;
while(y)
{c=y%2;
 if(c)++nr1;else++nr0;
y=y/2;
}
if(nr0==nr1)cout<<x<<' ';
}
return 0;
}