Answer:
A while loop is more suitable when the number of input is unknown but the last value of the input is known.
Step-by-step explanation:
The type of loop that is more suitable when the number of input is unknown but the last value of the input is known is a while loop.
A while loop is used when a certain condition needs to be met in order for the loop to continue running. In this case, the loop can continue until the last value of the input is known.
Here's an example of how a while loop can be used in this situation:
input = 0
while input != last_value:
input = get_input()
# do something with the input
# continue with the rest of the code