#include<iostream>

#include<vector>
#include<string>



int main(){
	std::string aName;
	std::string bName;
	int aYuruhuwapoint;
	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;
	}
	else{
		if (aYuruhuwapoint != bYuruhuwapoint){

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

		}
		else{

			std::cout << (-1) << std::endl;

		}


	}








	return 0;


}