Add Dollar Bills

Create a function that takes a string containing money in dollars and pounds sterling (seperated by comma) and returns the sum of dollar bills only, as an integer.

For the input string:

• Each amount is prefixed by the currency symbol: $ for dollars and £ for pounds.
• Thousands are represented by the suffix k.

i.e. $4k = $4,000 and £40k = £40,000

Examples

add_bill("d20,p40,p60,d50") ➞ 20 + 50 = 70

add_bill("p30,d20,p60,d150,p360") ➞ 20  + 150 = 170

add_bill("p30,d2k,p60,d200,p360") ➞ 2 * 1000 + 200 = 2200

Notes

There is at least one dollar bill in string.