Not able to make animation wait

 public  IEnumerator Wait(float waitTime){
         
         yield return new WaitForSeconds(waitTime);
         
         this.animation.Play ("yes");
         this.animation["aayaneho"].wrapMode = WrapMode.Once;
 
 
 
     }

void Update(){

if(!animation.isPlaying ) {

         StartCoroutine(Wait(10.0f));

     }

if(Input.GetKeyDown(KeyCode.S)) {

                     this.animation.Stop("yes");

         this.animation.Play("a");
         
         this.animation.Play("b");

     
         
     }

}

The scene is first it waits for 10 secs. Then it plays the yes animation.When i press the S key, it plays a and b animation and returns back to the yes animation. But what i want is to try stopping the yes animation and wait for 10 secs after the a and b animation is played and then play this yes animation again. So if key S is pressed when animation yes is being played, i want the yes animation to stop and play a and b animation to play.Then wait for 10 seconds if key S is not pressed then play this yes animation.