#include <iostream>

bool check(int a, int b) {
	while (a / 10 != b / 10) {
		a /= 10; b /= 10;
	}
	if ((a % 10) * (b % 10) == 28) {
		return a < b;
	}
	else {
		return a > b;
	}
}
int main() {
	int a, b;
	std::cin >> a >> b;
	if (check(a, b)) {
		std::cout << a << std::endl;
	}
	else {
		std::cout << b << std::endl;
	}
	return 0;
}