Write SQL query to solve given problem: Tell the number of papers that were presented at "International Symposium on Software Testing and Analysis" conference.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.Id) FROM Paper AS T1 INNER JOIN Conference AS T2 ON T1.ConferenceId = T2.Id WHERE T2.FullName = 'International Symposium on Software Testing and Analysis'