 Hi again. In this lesson, we're going to talk about that how to convert uppercase characters to lowercase and at the same time convert the lowercase to uppercase characters. For example, let's say that we have a string, let's call it myString and let's put inside it few words. For example, let's say New York and and now what we want to do is to convert all uppercase letters to the lowercase and at the same time convert all lowercase letters to the uppercase. So in order to do that, we're going to call function swap case this function will swap our letters, so uppercase letters become lowercase letters and lowercase letters become uppercase letters. That's all in this lesson. Thanks for watching. Bye. Bye