If you press ctrl+alt+backspace you "Delete all letters".
If you press ctrl+alt+U you "Convert all letters to uppercase".
If you press ctrl+alt+L you "Convert all letters to lowercase".
If you press ctrl+alt+C you "Combine highlighted images".
Please note you can input only 30 chars. And we can identify fonts using only the chars:
a b c d e f g h i j k l m n o p q r s t u v w x y z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 $ ? & % @