# loan.py

id = input("Enter your ID (ddd-dd-dddd): ")
while len(id)!=11 or id[3]!='-' or id[6]!='-' or\
      not id[0].isdigit() or not id[1].isdigit() or not id[2].isdigit() or\
      not id[4].isdigit() or not id[5].isdigit() or\
      not id[7].isdigit() or not id[8].isdigit() or not id[9].isdigit() or not id[10].isdigit():
    id = input("Invalid ID. \n Enter your ID (ddd-dd-dddd): ")         
 
cust_type = input("R(egular) or P(referred) customer: ").upper()
while cust_type!='R' and cust_type!='P':
    cust_type = input("Invalid customer type.\n  R(egular) or P(referred) customer: ").upper()

if cust_type=='R':
    daily_interest_rate = 10/100/365
else:
    daily_interest_rate = 8/100/365
    
balance = float(input("Enter the initial loan: "))
while balance < 0:
    balance = float(input("Can not be negative!. \n  Enter the initial loan: "))

payment_number = 1
previous_payday = 1
total_interest = 0

while balance > 0:
    payday = int(input("Enter pay day: "))
    while payday < previous_payday:
        payday = int(input("Can not be before the previous payday.\n Enter pay day: "))
    
    payment = float(input("Enter payment #"+str(payment_number)+": $"))
    while payment <= 0:
        payment = float(input("Must be a positive number.\n Enter payment #"+str(payment_number)+": $"))

    for day in range(previous_payday+1,payday+1):  #each day's interest, compounding
        day_interest = balance*daily_interest_rate
        balance += day_interest
        total_interest += day_interest

    previous_payday = payday

    balance -= payment
    print("  Balance: $", round(balance,2))

    payment_number += 1

print("\nYou paid off your loan in",(payment_number-1),"payments.")
print("You paid a total interest of $"+str(round(total_interest,2)))
if balance < 0:
    print("You overpaid, so $"+str(round(-balance,2))+" will be credited to your account.")