Homework Answers

Akshya is given a list of N integers. Each number in the list appears exactly for one number. help akshya by identifying the numbers which appeared exactly once in the list.

Input

The input contains a single-line comma-separated integers.

Output

The output contains a single-line comma-separated integers.

Sample Input1

8,9,5,8,5,6

Sample Output1

9,6

Sample Input2

1,2,3,4,5,1,2,3,4

Sample Output2

5

The principal of a school wants to speak with some of the students to assess their over all development including studies,most of the teachers were selecting the toppers of their classes but Mr,sam thought of an idea to select the bunch of students who did not have much difference in their marks so that he gains the reputation of a teacher who teaches well to the whole class and not just to a bunch of brilliant students.

Your are required to help mr,sam in selecting K students that can speak with principle from his class .you need to return an integer array representing the marks of the selected students sorted in ascending order.

Example1:

Input1:10

Innput2:{950,477,55,602,881,302,859,438,551,382}

Input3:1

Output:{950}

Andy has the word W and he wants to print the unique characters in the word in the order of their occurrence.write a program to help Andy print the unique characters as described above.

NOTE : consider lower and upper case letters as different

Input

The input is a single line containing the word W.

Output

The output should be a single line containing space separated characters.

Explanation

In the example, the word is MATHEMATICS

The unique characters in the given word are M, A, T, H, E, I, C, S, in the order of occurrence.so the output should be M A T H E I C S.

Sample Input1

MATHEMATICS

Sample Output1

M A T H E I C S

Sample Input2

banana

Sample Output2

b a n