Your question is a bit odd.
If this was not a qualified retirement account, then it was a simple stock market brokerage account. In that case, you inherited the account at the present value as of the day your father died. If you cashed it out immediately, you would have no taxable gain or loss. If you cashed it out later, you may have had a taxable gain or deductible loss, and you may have received dividends. I would expect the broker to have sent you a 1099-DIV, a 1099-B and possibly a 1099-INT for the year in which you cashed out the account.
Maybe they put the money in a simple money market fund, and you withdrew it so fast that it didn't earn interest?
