class Drill:
def __init__(self, x, y):
self.x = x
self.y = y
def drill_right(self, count):
self.x = self.x + count
drill_1 = Drill(1,13)
drill_2 = Drill(5,12)
drill_3 = Drill(9,11)
drill_4 = Drill(13,10)
drills = [drill_1, drill_2, drill_3, drill_4]
for drill in drills:
drill.drill_right(4)