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`.
import re

def sum_from_string(str_):
    return sum(map(int, re.findall(r'\d+', str_)))
import re

def sum_from_string(str_):
    return sum(map(int, re.findall(r'\d+', str_)))