You have two baskets,each one contains 15 small balls( 5 Yellow,5 Red,and 5 Blue),you should exchange each two balls from one basket with one ball from the other basket,according to these roles:

1- Yellow+Yellow....... should be exchanged with a red ball.

2- Red +Red..........should be exchanged with a Blue ball.

3- Blue +Blue..........should be exchanged with a Yellow ball.

4- Yellow +Red..........should be exchanged with a Blue ball.

5- Red + Blue........should be exchanged with a Yellow ball.

6- Blue + Yellow.....should be exchanged with a Red ball.

7- each of the above exchanges will be considered as one step.

Your aim is to get only ONE Yellow ball in one of these two baskets in less than 14 steps.

Have a nice trial