How can I book rooms in Tirumala through online

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Hi Friends, I need your help on this, actually we scheduled a trip to Tirupati suddenly and luckily we got tickets as well but the problem is about accommodation, I know the process of waiting in the line and book the rooms in Tirumala but we will reach Tirumala at night time so I think at that time there will be no rooms booking and I tried to book rooms through advance booking but it should be before 1 month, Can anyone tell me or suggest me how can I get rooms before we reach there....