Code Coach "Mathematics" C++ test 4 bugged?

Question

Code Coach "Mathematics" tests are all green except test 4. The answers (output) are "none" or "index (number)". Not even manual entry up to "index 50" got green on test 4. If someone can look at the tests and say if test 4 is in correct format would be greatly appreciated. Thank you for your time.
https://code.sololearn.com/cdsLRh2j3hQx/?ref=app

Learned a new one lol cin.ignore(). It now can take as many expressions (index) as a single string can hold. I also set it up to handle division at the same time as multiplication in case it was one of those order of operations conflicts. Still can't get test 4. I did say that I manualy entered "none", "index 0", "index 1",..., "index 50". So does test 4 have more expressions than a single string can hold?

Answer 1

List of mathematical expression ... May have more than 3 expressions...!!