Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.

Ex Input:
Steps: (1) Waves hit the coast (2) Waves have energy that pushes the water and sediment (3) Water washes the sediment back (4) Some sediment is left as sand.  
Where does the following step fit into the given list of steps: The sediment can help erode land like sandpaper 

Ex Output:
 After step 2. 


Ex Input:
Steps: (1) The human body takes a breath inward (2) Air is transported to the lungs (3) Air reaches the alveoli, the smallest air sacs in the lungs (4) In the alveoli, air passes into the blood within small capillaries (5) The dissolved oxygen is picked-up by red blood cells (6) The red blood cells bind the oxygen via a protein called heme (7) Red blood cells circulate throughout the body and reach the various tissues (8) Within small capillaries, the heme release the oxygen (9) The oxygen can then reach the cells within the tissue  
Where does the following step fit into the given list of steps: The gaseous oxygen in the air dissolves into the capillary blood 

Ex Output:
 After step 4. 


Ex Input:
Steps: (1) A photovoltaic cell is created with two layers of semiconductor material (2) The top layer are &#x27;doped&#x27; with impurities to allow a negative charge (3) The bottom layer are &#x27;doped&#x27; to allow for a positive charge (4) This produces an electric field that allows electrons to flow from negative to positve (5) Sunlight enters the cell (6) Energy from sunlight knocks electrons loose in both fields (7) This prevents the flow of electrons from negative to positive (8) Give the cells owner a flow of electricity.  
Where does the following step fit into the given list of steps: Adding an external circuit allows the exchange to continue 

Ex Output:

 After step 7.