using namespace std;

// 判断是否为闰年的函数
bool rn(int n) {
    return ((n % 4 == 0 && n % 100 != 0) || (n % 400 == 0));
}

int main() {
    int x, y;
    cin >> x >> y;

    int cnt = 0;
    int a[1500];

    for (int n = x; n <= y; n++) {
        if (rn(n)) 
		{
            a[cnt] = n;
            cnt++;
        }
    }

    cout << cnt << endl;
    for (int i = 0; i < cnt; i++) {
        if (i > 0) {
            cout << " ";
        }
        cout << a[i];
    }
    cout << endl;

    return 0;
}

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