Here is a way to have some extra fun with sending notes to a friend. First your need a key to be able to unlock the message. You can make up your own, but below is one you can use.

A = 11
B = 10
C = 21
D = 22
E = 24
F = 1
G = 14
H = 17
I = 9
J = 13
K = 2
L = 8
M = 5
N = 26
O = 3
P = 25
Q = 20
R = 7
S = 16
T = 4
U = 12
V = 15
W = 23
X = 19
Y = 6
Z = 18

OK so now you have the key and ready to write your own message. Below is a message by Abraham Lincoln for you to figure out.

(4 17 9 26 14 16) (5 11 6) (21 3 5 24) (4 3) (4 17 3 16 24) (23 17 3)
( _ _ _ _ _ _ ) ( _ _ _ ) ( _ _ _ _ ) ( _ _ ) ( _ _ _ _ _ ) ( _ _ _ )


(23 11 9 4) (10 12 4) (3 26 8 6) (4 17 24) (4 17 9 26 14 16) (8 24 1 4)
( _ _ _ _ ) ( _ _ _ ) ( _ _ _ _ ) ( _ _ _ ) ( _ _ _ _ _ _ ) ( _ _ _ _ )


(10 6) (4 17 3 16 24) (23 17 3) (17 12 16 4 8 24).
( _ _ ) ( _ _ _ _ _ ) ( _ _ _ ) ( _ _ _ _ _ _ ).