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Problem
Given a string S and integer K, print the K-th distinct character in S (by first appearance). If there are less than K distinct, print "None".
Input format
Input
input.txt
- String S (1–100) - Integer K (1–100)
Output format
Output
output.txt
- The K-th distinct character or "None"
Example
input
banana 3
output
n
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Sample cases (from the problem)
Sample Case 1
Input
banana 3
Expected output
n
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