The Old English alphabet letters were 29: A B C D E F G H I K L M N O P Q R S T V X Y Z & ⁊ Ƿ Þ Ð Æ
The Old English alphabet was recorded in the year 1011 by a monk named Byrhtferð and included the 24 letters of the Latin alphabet (including ampersand) and 5 additional English letters: Long S (ſ), Eth (Ð and ð), Thorn (þ), Wynn (ƿ) and Ash (ᚫ; later Æ and æ).
With respect to Modern English, Old English did not include J, U, and W.