#include <iostream>
using namespace std;

int main(void) {

	int A, B, i, t;
	cin >> A >> B;

	for (i = A; i <= B; i++) {
		if (i % 3 == 0) cout << i << endl;
		else {
			for (t = i; t >= 3; t /= 10) {
				if (t % 10 == 3) cout << i << endl;
			}
		}
		break;
	}
	return 0;
}