Mercedes-Benz A-Class Operator's Manual page 255

Using the keyboard
1
Input line
2 Displays suggestions during entry
3 Deletes the entry
4
Deletes
Pressing or pressing briefly deletes the last
character entered
Pressing and holding deletes the entry
5
Accepts an entry
6 Switches to handwriting input
7 Enters a space
8
Changes the keyboard language
9 Switches to special characters
MBUX (Mercedes-Benz User Experience) 253
A
Switches to digits and additional special
characters
ABC Switches to letters (level 2)
B Pressing or pressing briefly switches
between upper-case and lower-case letters
Pressing and holding switches to upper-case
letters permanently