Hello, I am validating fields and I cannot find a way to validate the text field that enters only letters and in the same way the number field so that it enters only numbers. I have the input value placed in the field type, which is in this case that I want it to be for text only, but the drawback is that when writing in the application it can be saved if I put numbers in the field that is only for text, How can I do so that I enter only letters and not numbers in the text field, I appreciate your help, please.