2908 상수

def func_restring(s):
    res = ''
    for i in range(len(s)):
        res += s[len(s) - i - 1]
    return res
 
 
def main():
    temp = input()
 
    a = temp.split(' ')[0]
    b = temp.split(' ')[1]
 
    A = int(func_restring(a))
    B = int(func_restring(b))
 
    if A < B:
        print(B)
    else:
        print(A)
 
 
if __name__ == '__main__':
    main()