X250: sumNumbers

Given a string, return the sum of the numbers appearing in the string, ignoring all other characters. A number is a series of 1 or more digit chars in a row. (Note: Character.isDigit(char) tests if a char is one of the chars '0', '1', .. '9'. Integer.parseInt(string) converts a string to an int.)

Examples:

sumNumbers("abc123xyz") -> 123
sumNumbers("aa11b33") -> 44
sumNumbers("7 11") -> 18
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