Given a random string consisting of numbers, letters, symbols, you need to sum up the numbers in the string. 

Note:

- Consecutive integers should be treated as a single number. eg, `2015` should be treated as a single number `2015`, NOT four numbers
- All the numbers should be treaded as positive integer. eg, `11-14` should be treated as two numbers `11` and `14`. Same as `3.14`, should be treated as two numbers `3` and `14`
- If no number was given in the string, it should return `0`


Example:

```
str = "In 2015, I want to know how much does iPhone 6+ cost?"
```

 The numbers are `2015`, `6`

Sum is `2021`.