1 1 1 1 2 2 2 2 3 3 3 3 parenleft parenleft parenleft parenleft parenright parenright parenright parenright 4 4 4 4 5 5 5 5 6 6 6 6 numbersign numbersign numbersign numbersign asterisk asterisk asterisk asterisk 7 7 7 7 8 8 8 8 9 9 9 9 plus plus plus plus minus minus minus minus 0 0 0 0 Return Return Return Return space space space space BackSpace BackSpace BackSpace BackSpace