Given a string , return the minimum no.of characters to delete to make frequency of all the characters equal.\n**Note**: The string only contains lowecase letters\n\n```\nEx: "xyzxyyxzzzz"\noutput: 2\nExplanation : The fequency of elements x->3,y->3,z->5 . So we can delete the extra 2 z\'s to make frequency of all elements equal. \n```\n\n```\nEx: "xyz"\noutput : 0\nExplanation : The frequency of all elements is already equal.\n```\n\n*This question was asked in relevel exam recently*\n

Given a string , return the minimum no.of characters to delete to make frequency of all the characters equal.\nNote: The string only contains lowecase letters\n