my $command = <STDIN>;
my $counter = 1;
#perform the add operation if the command is add
if (($command eq 'add') || ($command eq 'a')){

    my $numIn = 0;
    my $currentNum = 0;
    #While NONE is not entered, input numbers.
    while ($numIn ne 'NONE'){
        if($counter == 1){
            print "nEnter the first number: ";
        }else{
            print "nEnter the next number or NONE to be finished.";
        }
        $numIn = <STDIN>;
        $currentNum = $currentNum + $numIn;

        $counter++;
    }

    print "nThe answer is: #currentNum n";

#perform the subtract operation if the command is subtract
}`

$command =~ /^a/i

chop($command)