Print Subsequences Recursive

Given a string S, print all its subsequences (including empty string) using recursion, one per line, in any order.

Input input.txt

- A string S (length 1 to 10, lowercase only)

Output output.txt

- All subsequences, one per line (empty string included as a blank line)

input

ab

output

(blank line)
a
b
ab

Sample Case 1

Input

ab

Expected output

(blank line)
a
b
ab

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