Finding sevens

How many times does the number '7' appear in String a?

1
String a = "1628261829271628239271982027282927827618227261434335242627282928276272728292918972625252728921011514252431524251524152524254253435241534223392028302029382002929102102929101192928101019298281910101010991929121900101010292991010101029920101092929128919010101929928912910101828272663272818182726256352562615624236252377777215252616252541256625421652392029281710000001010929298282781818288272718821827271288182712819889192919818991292191212272726167172762626216163515251.";
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