Create a function to determine if the sum of all the individual even digits are greater than the sum of all the individual odd digits in a string of numbers.
"Odd is greater than Even"."Even is greater than Odd"."Even and Odd are the same".even_or_odd("22471") ➞ "Even and Odd are the same"
even_or_odd("213613") ➞ "Even and Odd are the same"
even_or_odd("23456") ➞ "Even is greater than Odd"
The input will be a string of numbers.