In minecraft seed? sugar cane help?

Okay, here's the deal, I'm playing the seed Roughsauce, (Capitalized R is IMPORTANT) and i cant seem to find sugar cane ANYWHERE!! Since I'm on a Mac, I can't use things like Cartographer. the coordinates for my home are X:-28.0 Y: 70.6 Z:-125.7 (Its a cozy little cave high up, so mobs can't walk in). So if you can find any sugar cane, with or without Cartographer, let me know, and give me coordinates. To enter seeds, just type in Roughsauce (It's Roughsauce, not roughsauce) under the world name where it says enter seed