EOFError: EOF when reading a line How can I fix this coe?

Question

def get_days_in_birthday_month():
    date = input("Enter your Birthday (dd/mm/yyyy):")
    x = date.split("/")
    month = x[1];
    if(month=="1" or month=="3" or month=="5" or month=="7" or month=="8" or month=="10" or month=="12" ):
        return "31";
    elif (month=="4" or month=="6"  or month=="9" or month=="11"):
        return "30";
    else:
        return "29";

    
days = get_days_in_birthday_month()
print("The number of days is:" + days)

    ***Error***
    Traceback (most recent call last):
      File "__tester__.python3", line 23, in <module>
        print("The number of days is: " + get_days_in_birthday_month())
      File "__tester__.python3", line 8, in get_days_in_birthday_month
        date = input("Enter your Birthday (dd/mm/yyyy):")
      File "__tester__.python3", line 3, in input
        s = __saved_input__(prompt)
    EOFError: EOF when reading a line

I got eof error for this code and I don't know how to fix it . How can I fix this eof error to get this code right?