If i have a list strings:

```
first = []
last = []

my_list = ['  abc   1..23',' bcd    34..405','cda        407..4032']

```

how would i append the numbers flanking the .. to their corresponding lists ? to get:

```
first = [1,34,407]
last = [23,405,4032]

```

i wouldn't mind strings either because i can convert to int later

```
first = ['1','34','407']
last = ['23','405','4032']

```