Problem: Write a C++ program that would implement the function called filterString which accepts a strings that contains numbers and letters mixed up. The function must return an integer corresponding to the numbers in s in the order that they appear. If there are no numbers in s, the function should return 0. TEST CASES: filterString('123') = 123 filterString('abc") = 0 filterString('aa 112 3dd')= 1123

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