Sudoku keyboard / keyboard

when we do things while the use
of computers, we usually use on
e-handed operation keyboard to
type, but because of the keyboa
rd letters span large, will cau
se inconvenience and wrong oper
ation.Thedesign is in the origi
nal digital keyboard.Input to
join scratchable latex on the
basis of letters, which is con
venient for our operation.