Printing strings.. help..

[zepel]

My first defined function works, however I can't get my second defined function to work. I need my main function to access the upperCase function and then print everything in all caps. For example the user enters in hi, I need my program to convert that to HI. For the love of god I can't figure out where I am going wrong. Can anybody show me? Thanks.

Also, how can I get my program to run nonstop? I'm kind of new with looping. 

def reverse(text):
    rev_text = ""
    for i in text:
        rev_text = i + rev_text
    return rev_text


def upperCase(text1):
    text1 = s.upper()
    return text1


def main():
    
    text = str(input("Enter a text: "))
    print(reverse(text))

    text1 = str(input("Enter a number again: "))
    print(upperCase(text1))


main()