Why is my python function not being executed even if there's no error? [closed]

I'm fairly new to python and I'm trying to create a Season Checker. So far I only have spring, but when I run the code, nothing executes. Am I missing something?

def season_checker(month, day):
    spring = 'March', 'April', 'May', 'June'
    
    if (month == 'March' and 20 >= day >= 31):
        spring = str(month), day, 'is a spring day'
    elif (month == 'April' and 1 >= day >= 30):
        spring = str(month), day, 'is a spring day'
    elif (month == 'May' and 1 <= day <= 31):
        spring = str(month), day, 'is a spring day'
    elif (month == 'June' and 1 >= day >= 20):
        spring = str(month), day, 'is a spring day'
    else:
        spring = str(month), day, 'is an unreconized month and day'

    return spring

   
def main():
    user_month = input("Enter month: ")
    month = user_month.lower()
    user_day = int(input("Enter day: "))
    season = season_checker(user_month, user_day)

main()