a1

#include <iostream>
using namespace std;
int main()
{
    int a, b, c, d, e;

    cin >> a >> b;

    if (a % 2 == 0)
    {
        cout << a << " ";
        c = a;
        while (c < b)
        {
            c = a;
            a = c + 2;
            cout << a << " ";
            c = a;
        }
    }
    else
    {
        d = a + 1;
        cout << d << " ";
        c = d;
        a = d;
        e = b - 1;
        while (c < e)
        {
            c = a;
            a = c + 2;
            cout << a << " ";
            c = a;
        }
    }

    return 0;
}