5. There are three vessels A,B, and C with capacities 5, 3 and 2 respectively. There is a computer program that can perform certain functions as described below:

Drain (Y) : drains the liquid in a vessel Y.Fill (X,Y) : fill amount from Y into X such that the amount of liquid withdrawn from Yis equal to the liquid in X.Empty (X,Y) : empty amount from Y into X such that the amount left in Y is equal to the amount of liquid in X.

**The following operations are performed in succession**

1. Fill (C,A) 2. ——— 3. Fill (C,A)
What should the second operation be if after the three operations A should contain one litre of liquid?