Repeated customer id

Problem

A support desk logs customer ids as tickets arrive. Print YES if any id appears more than once, and NO if all ids are different.

Example

Input

5
101 205 330 205 410

Output

YES

205 appears twice.

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

Hint 1

A set holds each id once. Compare its size with n.

Hint 2

No loop inside a loop is needed.

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