Check if all given strings are isograms or not
Given an array arr containing N strings, the task is to check if all strings are isogram or not. If they are, print Yes, otherwise No. An Isogram is a word in which no letter occurs more than once. Examples: Input: arr[] = {"abcd", "derg", "erty"}Output: Yes Input: arr[] = {"agka", "lkmn"}Output: No