#include<iostream>

#include<vector>
#include<string>



int main(){
	std::string aName;
	std::string bName;
	unsigned int aYuruhuwapoint;
	unsigned int bYuruhuwapoint;
	char aHand;
	char bHand;
	std::cin >> aName >> aYuruhuwapoint >> aHand;
	std::cin.ignore();
	std::cin >> bName >> bYuruhuwapoint >> bHand;

	if (aYuruhuwapoint > bYuruhuwapoint){
		std::cout << aName << std::endl;
	}

		if (aYuruhuwapoint <bYuruhuwapoint){

			std::cout << bName << std::endl;

		}
		if(aYuruhuwapoint==bYuruhuwapoint){

			std::cout << "-1" << std::endl;

		}











	return 0;


}