#!/usr/bin/env python2
import rospy
from std_msgs.msg import String
from geometry_msgs.msg import Twist

def callback(data):

	print data.linear.x, data.linear.y, data.linear.z
    #rospy.loginfo("I heard %s", data.data)
    
def listener():

    # In ROS, nodes are uniquely named. If two nodes with the same
    # name are launched, the previous one is kicked off. The
    # anonymous=True flag means that rospy will choose a unique
    # name for our 'listener' node so that multiple listeners can
    # run simultaneously.
    rospy.init_node('listener', anonymous=True)
	
    rospy.Subscriber("chatter", Twist, callback)

    # spin() simply keeps python from exiting until this node is stopped
    rospy.spin()

if __name__ == '__main__':
    listener()
