题解 | #图片整理#

import sys


def run(words):
    l_ascii_words = []
    l_c_words = []
# 字符串都装成ASCII码
    for c in words:
        l_ascii_words.append(ord(c))
# 按照ASCII码排序
    l_ascii_words.sort()
# 将ASCII转换成字符串
    for c in l_ascii_words:
        l_c_words.append(chr(c))
    return ''.join(l_c_words)


if __name__ == '__main__':
    words = sys.stdin.readline().strip()
    r = run(words)
    print(r)