Alex is the fund manager of a Hong Kong equities fund. Thanks to the recent bullish performance of the local stock market, the market value of his equity fund portfolio has reached HKD360 million. As a shrewd and prudent fund manager, John starts to worry that this stock market heyday will not last long. Suppose today is 1 June 2015 and according to John's analysis, the market correction will happen in the next month. He is now considering using September 2015 Hang Seng Index futures to hedge the risk exposure of his equity fund. Further market information is shown as follow, ignoring transaction costs:

1 June 2015:

Closing (1june2015) 29,800

September contract price 30,000

Contract Multiplier HKD 50 per index point

Margin requirement HKD 91,850 per HSI futures contract

Whether Alex should long or short HSI futures in order to implement hedging? Calculate the number of futures contracts and the amount of margin deposit needed.