—First make a 7x7 square write an alphabet and no. 0-9.
AD F G V X
A|a b c d e f
D|g h i j k l
F|mn o p q r
G|s t u v w x
V|y z 0 1 2 3
X|0 4 5 6789
A D F GV X—if the message is 'leave me alone ' convert the letter base to its coordinates in the square that we make.
LEAVE ME ALONE-DXAVAAGGAVFAAVAADXFFF