Czech has one of the most phonemic orthographies of all European languages. Its thirty-one graphemes represent thirty sounds (in most dialects, i and y have the same sound), and it contains only one digraph: ch, which follows h in the alphabet. As a result, some of its characters have been used by phonologists to denote corresponding sounds in other languages. The characters q, w and x appear only in foreign words. The hacek () is used with certain letters to form new characters: s, z, and c, as well as n, e, r, t, and d (the latter five uncommon outside Czech). The last two letters are sometimes written with a comma above (', an abbreviated hacek) because of their height. The character o exists only in loanwords and onomatopoeia.
Is there an answer to this question (If it cannot be answered, say "unanswerable"): What character in Czech only exists in loanwords?
o