Remove duplicates from a sorted list

Problem

A sorted linked list of marks may repeat values. Delete duplicate nodes so each value appears once, and print the list.

Example

Input

1 1 2 3 3 3

Output

1 2 3

Try the problem first. Open one hint at a time.

Hint 1

Compare each node with the next one.

Hint 2

If they are equal, skip the next node and stay on the same node.

Write your Python code, run it on the examples and submit it to hidden tests.