Your input looks like it might be romanized Japanese 「default」. To convert romaji to kana, see this page.
※ In the above table, the entries in grey are words which could
not be found in the dictionary, and so the katakana was guessed based
on the word's spelling.
The first kana column is based on pronunciation and spelling. The
second kana column is based on pronunciation only. When these are
identical, the second column is omitted.