Look-and-Say Next Sequence

Given a number as a digit string, produce the next look-and-say term by replacing each run of the same digit with `count` followed by that digit. Requirements Input is an integer-like digit string inputNum representing the given number. Treat the input as a string, not as an integer to be arithmetically decomposed. For each consecutive run of N copies of digit D, append N followed by D to the output string. Output the resulting string. Examples Input: 225 Output: 2215 Explanation: two 2s followed by one 5 becomes 22 + 15. Input: 1211 Output: 111221 Notes Preserve leading zeros if they appear, since the task is run-length encoding over a digit string. The output is a string, even though the input is described as an integer.