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Problem
Given a string S, print all unique characters in S (order of first appearance), each on a new line.
Input format
Input
input.txt
- String S (1–100, lowercase)
Output format
Output
output.txt
- Unique characters, each on its own line
Example
input
hello
output
h e l o
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Sample cases (from the problem)
Sample Case 1
Input
hello
Expected output
h e l o
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