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You need to use the accumulator pattern here. The accumulator pattern always begins by setting the accumulator variable before your for loop. In this case, you are accumulating strings, so your accumulator should start at "".

Inside of your for loop, you need to accumulate. Accumulation is usually of the form accumulator = accumulator + some_value, but the operation can sometimes change.

In this case, you want to accumulate any character that is not the "#". Use an if statement in order to facilitate this.

This activities is also going to use a for loop. In this case, you don't have a string you are executing on. However, you do know the range of integers you want to iterate over.

You again need to use the accumulator pattern here. Since we are counting, we want our accumulator to start at 0.

You only want to increment the accumulator if the loop variable divides some_integer. You can tell if a number $x$ divides $some\_integer$ if $some\_integer \mbox{ } \% \mbox{ } x \mbox{ } == \mbox{ } 0$.