Description

输入两个字符串a,b，输出输出字典序靠前的字符串

Format

Input

两个字符串长度范围 $1\leq x,y\leq 32767$ .

Output

输出字典序靠前的字符串

Samples

abc
bda

abc

Limitation

1s, 1024KiB for each test case.