Capitalization is writing a word with its first letter as a capital letter. Your task is to capitalize the given word.

Note, that during capitalization all the letters except the first one remains unchanged.
A single line contains a non-empty word. This word consists of lowercase and uppercase English letters. The length of the word will not exceed 10<sup class="upper-index">3</sup>.
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Sep 26 14:29:02 2023

@author: huangxiaoyuan
"""

s=input()
list1=[]
for i in s:
    if i in ['1','2','3']:#注意这里：输入的‘1’，‘2’，’3‘，都是str格式，不能直接[1,2,3]!
        list1.append(i)
list1.sort()#注意不要用list1=list1.sort(),否则将输出none。
        
str=''
for j in list1:
    str+=j
    str+='+'
    
str1=str[:-1]
if len(str1)<=100:
   print(str1)
        