C++ Programming. only use the iostream library and using namespace std; also please dont use the ascii chart thanks

Write a function, IsAllLower, that takes a string as input and returns true if all the alphabetic characters in the string are lowercase alphabetic characters. The function returns false otherwise. If input string contains non-alphabetic character, return false. Your function should be named IsAllLower Your function has one input argument of type string Your function has one return value of type boolean evaluating to true if the input string contains all lowercase alphabets, false otherwise Your function should not print anything Example: Calling function with string "onetwo", should return true. Calling function with string "onEtwo", should return false. Calling function with string "^#$%123", should return false. Edge Case: If the string is empty, return true.