Write a function called herdTheBabies which takes a string as its argument. The string will consist of several 'baby' (lowercase) letters, that belong to a 'parent' (uppercase) letter.
The function should return a string that is sorted alphabetically, with the parent letter coming before its babies.
EXAMPLES:
herdTheBabies('aA') //should return 'Aa'herdTheBabies('aBA') //should return 'AaB'herdTheBabies('bbaBccAC') //should return 'AaBbbCcc'