How do I use string manipulating functions, to pull numbers out of strings and add them together?

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john calzone 2014-3-17

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关闭： Walter Roberson 2014-3-18

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 Two variables store strings that consist of a letter of the alphabet, a blank space, and a number (in the form ‘R 14.3’).  Write a script that would initialize two such variables.  Then, use string manipulating functions to extract the numbers from the strings and add them together