2098

import sys

sys.stdin = open("input.txt","rt")

a,b = map(str, sys.stdin.readline().strip().split())

a_list = []
b_list = []


for i in a:

    a_list.append(i)


for j in b:

    b_list.append(j)

a_list.reverse()
b_list.reverse()

a_rever = "".join(a_list)
b_rever = "".join(b_list)


if int(a_rever) > int(b_rever):
    print(a_rever)

else:
    print(b_rever)