def addDigitsInString(string):
    total = 0
    isNumberInString = False
    charArray = list(string)
    lengthArray = len(charArray)
    for i in range(lengthArray):
        if (charArray[i].isdigit() == True):
            total += int(charArray[i])
            isNumberInString = True

    if (isNumberInString == True):
        return total
    return 0

print(addDigitsInString("Somebody is the best"))
print(addDigitsInString("C011n15"))