Words - K Selection - 1

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2. Think of a solution approach, then try and submit the question on editor tab.
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1. You are given a word (may have one character repeat more than once).
2. You are given an integer k.
2. You are required to generate and print all ways you can select k distinct characters out of the
word.

Note -> Use the code snippet and follow the algorithm discussed in question video. The judge can't
force you but the intention is to teach a concept. Play in spirit of the question.
Input Format
Input is managed for you
Output Format
Check the sample ouput and question video. 
Question Video
Constraints
0 < str.length() < 15
0 < k <= str.length()
Sample Input
aabbbccdde
3
Sample Output
abc
abd
abe
acd
ace
ade
bcd
bce
bde
cde


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