## Answer:

In your program tou are using randint function but you did not import it .

So you should write something like:

`Import random`

or

`from random import randint`

So your code should be like:

```
import random
def random():
a = random.randint (0, x+1)
b = random.randint (0, y+1)
c = random.randint (0, z+1)
outer_function(a,b,c)
if outer_function(a,b,c) is True:
break
if outer_function(a,b,c) is False:
random()
```

or

```
from random import randint
def random():
a = random.randint (0, x+1)
b = random.randint (0, y+1)
c = random.randint (0, z+1)
outer_function(a,b,c)
if outer_function(a,b,c) is True:
break
if outer_function(a,b,c) is False:
random()
```

Happy coding