- Time limit: 1.00 s
- Memory limit: 512 MB
Given a string, your task is to generate all different strings that can be created using its characters.
Input
The only input line has a string of length . Each character is between a–z.
Output
First print an integer : the number of strings. Then print lines: the strings in alphabetical order.
Constraints
Example
Input:
aabac
Output:
20 aaabc aaacb aabac aabca aacab aacba abaac abaca abcaa acaab acaba acbaa baaac baaca bacaa bcaaa caaab caaba cabaa cbaaa