#!/usr/bin/python
PRICE=123.45
PAID=1300.0
change=PAID-PRICE
# Find largest denomination
c=-3
while True:
if int(change/pow(10,c)) == 0:
break
c += 1
while change>0:
c-=1
denomination = pow(10,c)
bills = int(change/denomination)
print "%d-%fs" % (bills,denomination)
change -= bills*denomination
change = round(change,2)