making a block diagram: sequential array stay a value

Hi, 

I'm trying to make a block diagram to get sequential outputs from same length of sequential inputs.

It seemed easy to make it before I actually was wiring array, but I stuck.

So what I want to do is this.

For example, sequential input value goes in say 5,4,3,2,1,2,3,4,3,2,.....

I want to get sequential output value as 5,4,3,2,2,2,2,2,....

Basically when input value hits 2 one time during sequential input, output needs stay at 2 whatever values goes into later.

Can someone help me out?

Thanks,

K