Jonathan's full name contains 8 letters for the first name and 10 letters for the surname. His sister's name has 5 letters for the first name and 10 letters for the second name. What's the total number of letters in their names? Think carefully first, then make a decision:
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Jonathan has 8 + 10 = 18 letters in his name. His sister has 5 + 10 = 15 letters in her name. The total number of letters in their names is 18 + 15 = 33. So, the answer is 33.
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