Subtract Product and Sum of Digits of a Large Number

Problem Given a non-negative integer num, which may be very large and is therefore provided as a string, split it into decimal digits and compute: product: the product of all digits sum: the sum of all digits Return product - sum. Input Format One line containing a string num consisting only of digit characters '0' to '9'. Output Format Print one integer: the difference between the product and the sum of all digits, i.e. product - sum. Constraints 1 <= len(num) <= 10^4 num contains only digit characters Leading zeros are allowed Output the exact integer, without modulo Example Input: 234 Output: 15 Explanation: the product is 2 * 3 * 4 = 24, the sum is 2 + 3 + 4 = 9, so the answer is 24 - 9 = 15. Example Input 234 Output 15