while True:
     try:
         xyz = raw_input("Dimensions: ")
         dimensionArray = xyz.split(" ")
         x = int(xyz[0])
         y = int(xyz[1])
         z = int(xyz[2])
     except ValueError:
         print("Not a number! Please try again.")
         continue
     else:
         break


array1 = numpy.zeros((x,y,z))
array2 = numpy.zeros((x,y,z))