can't boot os x, disconnected magic keyboard

Any help? stupidly when i was installing windows 10 my keyboard and mouse wasn't connecting, i read to disconnect them from os x, stupidly i did that, although i later go the mouse n keyboard working for windows 10, but now i can't boot os x?

because the keyboard wont connect to os x when it boots for me to hold the option key? is there anyway around this? i don't have a usb keybaord so is there anyway i can get it to connect while on windows? i doubt it