For letters, you use the numbers to maker what number the letter is in the alphabet as shown:

A - Unicorn
B - Graphorn
C - Runespoor
D - Fwooper
E - Quintaped
F - Salamander
G - Unknown
H - Acromatula
I - Hydra
J - Unicorn + Demiguise
K - Unicorn + Unicorn
L - Unicorn + Graphorn
M - Unicorn + Runespoor
N - Unicorn + Fwooper
O - Unicorn + Quintaped
P - Unicorn + Salamander
Q - Unicorn + Unknown
R - Unicorn + Acromantula
S - Unicorn + Hydra
T - Graphorn + Demiguise
U - Graphorn + Unicorn
V - Graphorn + Graphorn
W - Graphorn + Runespoor
X - Graphorn + Fwooper
Y - Graphorn + Quintaped
Z - Graphorn + Salamander