output_description: Print the coordinates ($x1$, $y1$) and ($x2$, $y2$) of the cross points $p1$
  and $p2$ respectively in the following rules.
  
    * If there is one cross point, print two coordinates with the same values.
    * Print the coordinate with smaller $x$ first. In case of a tie, print the coordinate with smaller $y$ first.
  
  The output values should be in a decimal fraction with an error less than
  0.000001.
input_description: The input is given in the following format.
  
  $c1x\; c1y\; c1r$  
  $c2x\; c2y\; c2r$  
  
  $c1x$, $c1y$ and $c1r$ represent the coordinate and radius of the first
  circle. $c2x$, $c2y$ and $c2r$ represent the coordinate and radius of the
  second circle. All input values are given in integers.
attempt: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  """
  input:
  0 0 2
  2 0 2
  
  output:
  1.00000000 -1.73205080 1.00000000 1.73205080
  """
  
  import sys
  from math import sin, cos, atan2, acos
  
  
  class Circle(object):
      __slots__ = ("centre", "radius")
  
      def __init__(self, centre=float("inf"), radius=-1):
          self.centre = complex(centre)
          self.radius = float(radius)
  
  
  def arg(p_vector):
      return atan2(p_vector.imag, p_vector.real)
  
  
  def polar(a, r):
      return cos(r) * a + sin(r) * a * 1j
  
  
  def get_circles_cross_points(c1, c2):
      centre_distance = abs(c1.centre - c2.centre)
      a = acos(
          (pow(c1.radius, 2) + pow(centre_distance, 2) - pow(c2.radius, 2))
          / (2 * c1.radius * centre_distance)
      )
      t = arg(c2.centre - c1.centre)
      p1, p2 = c1.centre + polar(c1.radius, t + a), c1.centre + polar(c1.radius, t - a)
  
      if p1.real < p2.real:
          ans = (p1, p2)
      elif p1.real == p2.real:
          if p1.imag < p2.imag:
              ans = (p1, p2)
          else:
              ans = (p2, p1)
      else:
          ans = (p2, p1)
      return ans
  
  
  def solve(_circle_info):
      for i, circle in enumerate(_circle_info):
          cx, cy, r = map(int, circle)
          circles[i].centre = cx + cy * 1j
          circles[i].radius = r
  
      cp1, cp2 = get_circles_cross_points(*circles)
      print(
          "{0:.8f} {1:.8f} {2:.8f} {3:.8f}".format(cp1.real, cp1.imag, cp2.real, cp2.imag)
      )
      return None
  
  
  if __name__ == "__main__":
      _input = sys.stdin.readlines()
      circle_info = map(lambda x: x.split(), _input)
  
      circles = [Circle() for _ in range(2)]
      solve(circle_info)
  
problem_description: Cross Points of Circles
  
  For given two circles $c1$ and $c2$, print the coordinates of the cross points
  of them.
samples: [{"input": "and Output\n\n  \n\n## Sample Input 1\n\n    \n    \n    0 0 2\n    2 0 2", "output": "1.00000000 -1.73205080 1.00000000 1.73205080"}, {"input": "0 0 2\n    0 3 1", "output": "0.00000000 2.00000000 0.00000000 2.00000000"}]