Repeated order id

Problem

A store receives n order ids. Print yes if any id appears more than once, otherwise print no.

Example 1

Input

5
101 102 103 104 102

Output

yes

The id 102 appears twice.

Example 2

Input

3
7 8 9

Output

no

All ids are different.

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

Hint 1

A set keeps one copy of each value.

Hint 2

If the set is smaller than the list, something repeated.

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