Trivial Training Problem
The task
You are given a list L of integer values. Print, in ascending order, a list of all duplicate values in L. Each value in the output should appear only once.
Input
The input contains a single line with a list of integers separated by spaces.
There are at least 2 and at most 1000 values in the input. All values are positive and do not exceed 1000.
Output
The output consists of one text line containing a list of duplicates in the input list.
The output values are separated by spaces and they are printed in ascending order.
The output list is guaranteed to be unempty.
Example 1
Input1 2 2 3 3 3
Output
2 3
Example 2
Input60 50 40 30 20 10 0 0 10 20 30 40
Output
0 10 20 30 40
Example 3
Input4 4 4 4 4 4 4 2 4 4 4
Output
4
Public data
The public data set is intended for easier debugging and approximate program correctness checking. The public data set is stored also in the upload system and each time a student submits a solution it is run on the public dataset and the program output to stdout and stderr is available to him/her.
Link to public data set