Six friends, Gopi, Sheela, Ravali, Sarayu, Hina and Giri, are standing in a row, facing to the north. There are two persons between Sheela and Hina. Ravali is between Hina and Sarayu. Only one person is standing ahead of Gopi. Giri is between Gopi and Hina. Hina is third from the back of the row. Which two persons are standing between Sheela and Hina?