Keras how to define two complicated loss function

Question

I used Keras to build a lstm to make prediction ，two output layers with it ，defined as out1 , out2 Now I want to combine out1,out2 with ytrue, the three variables to make two loss functions Just like

define myloss

  if out1 < ytrue < out 2 :
  return k=1
  else:
  return k=0
  Loss1= (out1-ytrue)+k
  Loss2= (out2-ytrue)+k