![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/6068148283
36140.jpg "=600 #left")
![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/6068148283
lst = list(map(int,input().split()))
lst.sort()
lst = [chr(i) for i in lst]
print('<'.join(lst))