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Лимит времени 2000/4000/4000/4000 мс. Лимит памяти 65000/65000/65000/65000 Кб.
Сложность Альфа
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 n. Each character is between a–z.
Output
First print an integer k: the number of strings. Then print k lines: the strings in alphabetical order.
Constraints
1≤n≤8
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
Для отправки решений необходимо выполнить вход.
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