1.1 KB | 1141 chars
"""
[32855: Which One is Larger](https://www.acmicpc.net/problem/32855)
Tier: Bronze 2
Category: arithmetic, implementation, math, parsing, string
"""
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
SYS_INPUT = True
RECURSION_LIMIT = 10 ** 7
SET_RECURSION = False
BLANK = " "
if SET_RECURSION:
sys.setrecursionlimit(RECURSION_LIMIT)
inp = lambda : sys.stdin.readline().rstrip() if SYS_INPUT else input()
mii = lambda : [*map(int,inp().split())]
mfi = lambda : [*map(float,inp().split())]
ii = lambda : int(inp())
fi = lambda : float(inp())
isplit = lambda : inp().split()
p = print
def gcd(a, b): return gcd(b, a % b) if b > 0 else a
def lcm(a, b): return a * b // gcd(a, b)
def solve():
a = input()
b = input()
_a = a.split(".")[0]
_b = b.split(".")[0]
tuple_a = [*map(int, a.split("."))]
tuple_b = [*map(int, b.split("."))]
if float(a) > float(b) and tuple_a > tuple_b:
print(a)
elif float(a) < float(b) and tuple_a < tuple_b:
print(b)
else:
print(-1)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()