The alphabet is made up of 26 letters. Here they are:

Some of these letters are called vowels:

The rest are called consonants:

Consonant digraphs are two consonants that join to make a single sound (phoneme). 

Listen to these consonant digraphs.

ch
sh
th
ph
wh

Listen carefully - you cannot hear each letter.  

Learning these sounds will help you read and spell.