Are you able to view this wiki entry? The correct characters are at the very top. I couldn't get the kanji to display right here:http://ja.wikipedia.org/wiki/%E5%AE%97%E5%AE%B6
If not, look up "souke" in a dictionary. People often drop "u" after "o" in Japanese words when writing in english to avoid mispronunciation, so it can make it hard to find the characters for those words.
By the way, you don't really say the "u"--it just indicates a "long" syllable (draw out the "o" sound for two beats) rather than a "short" one. English doesn't have this distinction, so it can be hard to recognize. For example, "dojou" is a kind of fish, but "doujou" is where bujutsu is studied.
Most Japanese speakers are able to figure out what you really mean to say from context, however!