The Walloon alphabet consist of the basic ISO Latin Alphabet, and four types of diacritic.
Diacritics
Diacritics used in this language are the acute accent (´), grave accent (`), circumflex (ˆ), ring (°), and cedilla (¸). In some dialects, the umlaut (¨) is used. These accents have no effect on the alphabetic order of these letters.
References
Walloon alphabet Wikipedia(Text) CC BY-SA