You will be given a definition of a task first, then some input of the task.
In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Context: "La balsa" was written by Litto Nebbialead vocalist of the bandand Tanguito (credited as Ramses) on May 2, 1967 Link Information: Juan Carlos Ongania Carballo (; March 17, 1914 June 8, 1995) was de facto President of Argentina from 29 June 1966 to 8 June 1970. Question: How long had Juan Carlos Ongania been leading Argentina by the year La balsa was written?
Output:
Answer: 11