John Olinda
Hmmm... It looks different on mine, had to hold the $ symbol and it popped up as a special option, but hey, it worked. I'm on iOS 7 though, so that might explain the difference.
Dongsung Kim
I think it's because my language/region setting is Korean/Korea. Not sure of the exact condition, but apparently tap & hold on $ symbol of English keyboard also shows W too. Strange...