Given a string, find the number of different characters in it.

Example

For s = "cabca", the output should be differentSymbolsNaive(s) = 3.

There are 3 different characters a, b and c.

Hints

• includes()
• split()
• push()

Input/Output

• [execution time limit] 4 seconds (js)

• [input] string s

  A string of lowercase English letters.

  Guaranteed constraints:

  3 ≤ s.length ≤ 1000.

• [output] integer