Play Attack Animation when Walk Animation is Playing

I use Key is down event to play a walking animation. Then I use On Left button Click on Some Object to play attack animation. This works if the walking animation is not playing. How do I play attack animation when walk animation is playing, then back to walk animation when attack animation ends? Thank you.

for this case, you need to make a new animation when the "player" attack and move at the same time.. and make the a condition if you click and pressed down button