One other letter, ß (the eszett 'ess-tset') is used for (voiceless) 's'.The vowels a, o, and u can take an umlaut (double dots above), becoming ä, ö, and ü. The umlaut changes the sound of the vowel.
Acquiring a good German accent is about more than knowing the alphabet, it’s very important to say words and phrases out loud on a regular basis. Listen as often as you can to the characters in German Steps and make a concentrated effort to imitate them closely.
In English, to clarify a word's pronunciation and spelling, it says "B for Ball". But in German they use names to spell and those names are fixed.