Question: Assume that string is a string of digits. Return the sum of the non-overlapping numbers ending in '9' in stringe. If there are no digits

 Assume that string is a string of digits. Return the sum

Assume that string is a string of digits. Return the sum of the non-overlapping numbers ending in '9' in stringe. If there are no digits '9' in string, then return 0. For example, add9('123') is a add9('119') is 119 odd9('0919293949596979891129) is o.19. 29 89 1129 = 1570

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