PERMPALAll submissions for this problem are available.<h3>Read problems statements in Mandarin chinese, Russian and Vietnamese as well.</h3>
You are given a string s with length n. You should find a permutation P of numbers 1 through n such that if you apply this permutation on the string s, you will get a palindromic string.
The result of applying a permutation P on the string s is a string t with length n such that for each i (1 ≤ i ≤ n), the i-th character of t is given as as t[i] = s[Pi].
For each test case, print a single line. If it is impossible to find a valid permutation P, this line should contain a single integer -1. Otherwise, it should contain n space-separated integers P1, P2, ..., Pn.
If there are multiple valid permutations, you may print any one.
Subtask #1 (20 points): 1 ≤ T, n ≤ 10
Subtask #2 (20 points): 1 ≤ T, n ≤ 100
Subtask #3 (60 points): 1 ≤ T ≤ 10
Input 4 aa baa abc abab Output 1 2 2 1 3 -1 1 2 4 3
Example case 1: The string t obtained using the identity permutation will have t[1] = s[1] and t[2] = s[2]. That means t = "aa", which is a palindrome.
Example case 2: The characters of the string t obtained by applying the permutation 2, 1, 3 are t[1] = s[2], t[2] = s[1] and t[3] = s[3]. Therefore, t = "aba", which is a palindrome.
Example case 3: There is no way to find a permutation P such that we can obtain a palindrome from s using it.
Example case 4: Applying the permutation 1, 2, 4, 3 on s results in t = "abba", which is a palindrome. Another permutation that you may apply is 2, 1, 3, 4; this results in t = "baab", which is also a palindrome.