You are given a string s.
Among the different substrings of s, print the K-th lexicographically smallest one.
A substring of s is a string obtained by taking out a non-empty contiguous part in s.
For example, if s = ababc, a, bab and ababc are substrings of s, while ac, z and an empty string are not.
Also, we say that substrings are different when they are different as strings.
Let X = x_{1}x_{2}...x_{n} and Y = y_{1}y_{2}...y_{m} be two distinct strings. X is lexicographically larger than Y if and only if Y is a prefix of X or x_{j} > y_{j} where j is the smallest integer such that $x_{j} \neq y_{j}$.

-----Constraints-----
- 1 ≤ |s| ≤ 5000
- s consists of lowercase English letters.
- 1 ≤ K ≤ 5
- s has at least K different substrings.

-----Partial Score-----
- 200 points will be awarded as a partial score for passing the test set satisfying |s| ≤ 50.

-----Input-----
Input is given from Standard Input in the following format:
s
K

-----Output-----
Print the K-th lexicographically smallest substring of K.

-----Sample Input-----
aba
4

-----Sample Output-----
b

s has five substrings: a, b, ab, ba and aba.
Among them, we should print the fourth smallest one, b.
Note that we do not count a twice.

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