Duplicate detection
We are trying to develop duplicate detection software. It should identify if a string appears as part of the previous strings. You would like to write a program that would print Duplicate if the inputted string is part of its predecessors and Unique otherwise.
The input contains 4 strings. For each of those, the program should print Duplicate if it has already appeared in any of the previous strings and Unique otherwise.
Input  | Output  | 
|---|---|
Hi, I would like to invite you to a conference  | Unique  | 
Constraints
Time limit: 2 seconds
Memory limit: 512 MB
Output limit: 1 MB