I have for example the index values:

```
x = [1, 4, 5, 7]

```

and I have a list of elements:

```
y = ['this','is','a','very','short','sentence','for','testing']

```

I want to return the values 

```
['is','short','sentence','testing']

```

When I attempt to print say:

```
y[1]

```

it will gladly return `['is']`. However, when I do `print(y[x]))` it will simply return nothing. How can I print all those indexes? Bonus: Then join them together.