B'One day in the IT lesson Anna and Maria learned about the lexicographic order. String x is lexicographically less than string y, if either x is a prefix of y (and x xe2 x80 x89 xe2 x89 xa0 xe2 x80 x89y), or there exists such i (1 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89i xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89min(|x|, xe2 x80 x89|y|)), that xi xe2 x80 x89< xe2 x80 x89yi, and for any j (1 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89j xe2 x80 x89< xe2 x80 x89i) xj xe2 x80 x89= xe2 x80 x89yj. Here |a| denotes the length of the string a. The lexicographic comparison of strings is implemented by operator < in modern programming languages xe2 x80 x8b xe2 x80 x8b. The teacher gave Anna and Maria homework. She gave them a string of length n. They should write out all substrings of the given string, including the whole initial string, and the equal substrings (for example, one should write out the following substrings from the string "aab": "a", "a", "aa", "ab", "aab", "b"). The resulting strings should be sorted in the lexicographical order. The cunning teacher doesn 't want to check all these strings. That 's why she said to find only the k-th string from the list. Help Anna and Maria do the homework. The first line contains a non-empty string that only consists of small Latin letters ("a"-"z"), whose length does not exceed 105. The second line contains the only integer k (1 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89k xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89105). Print the string Anna and Maria need -- the k-th (in the lexicographical order) substring of the given string. If the total number of substrings is less than k, print a string saying "No such line." (without the quotes). In the second sample before string "bc" follow strings "a", "ab", "abc", "b".'...