Create a function that takes a string, checks if it has the same number of x's and o's and returns either true or false.

• Return a boolean value (true or false).
• Return true if the amount of x's and o's are the same.
• Return false if they aren't the same amount.
• The string can contain any character.
• When "x" and "o" are not in the string, return true.

Examples

XO("ooxx") ➞ true

XO("xooxx") ➞ false

XO("ooxXm") ➞ true
# Case insensitive.

XO("zpzpzpp") ➞ true
# Returns true if no x and o.

XO("zzoo") ➞ false

Notes

• Remember to return true if there aren't any x's or o's.
• Must be case insensitive.