Need some help with Objective-C and Cocos2d(repost)

A need a peace of code totally explained: It must be a Cocos2d project that must do the following: 1 - It must create 10 sprites in the screen (where each sprite is a .png image that I can substitute when I need it); 2 - There will have a sequence that starts with a tap in the screen; 3 - When the event described in step 2 occurs, the application starts to blink the sprites one by one, in a one second interval; 4 - When it gets the 10th sprite blinked, the sequence will back to sprite number one; 5 - If the user taps again in the screen, the application must invert the direction of the sequence. All there I need is this, but the code must be all commented like a tutorial.