Largest Until Done

Read whole numbers one per line with the prompt Number: until the word done, then print Largest: <n> for the biggest one, or No numbers. when done came first. The first number must always be taken as the largest so far, so that a list of negative numbers works too (the count of numbers read tells you whether this is the first). Input: zero or more integers, one per line, then done. The prompts are part of the output and run together on one line in front of the result.