#include <string>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <list>
#include <stdexcept>
#include <functional>
#include <utility>
#include <iomanip>
#include <ctime>
#include <valarray>
#include <iostream>
#include <sstream>
#include <fstream>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
#define MEM(a,b) memset((a),(b),sizeof(a))
const LL INF = 1e9 + 7;
const int N = 2e5 + 10;

int main()
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	string s1, a, b, s2;
	char c1, c2;
	cin >> s1 >> a >> c1;
	cin >> s2 >> b >> c2;
	if (a == b)
	{
		puts("-1");
		return 0;
	}
	if (a.length() > b.length()) puts(s1.c_str());
	else if (a.length() < b.length()) puts(s2.c_str());
	else if (a > b) puts(s1.c_str());
	else if (a < b) puts(s2.c_str());
	else puts("-1");
	return 0;
}