What's wrong about this code?

Can you solved this? im so confused about this.

This error means you are trying to access an element in a list but the index you gave falls outside the size of the list. Check that any of the three lists has such index accessible.

I cant find where are the index. Can you help me please?

The index is the value of the i. You need to check those lists at the i-th index if the i-th element exists or not.