How to return random strings of random lenght in Python

I am working on a Python Function that has to generate random strings of random lenght. The function has 3 parameters:

a=The minimum lenght that the generated string can have

b=The maximum lenght that the generated string can have

n=The number of strings that the program has to create

Here some examples:

random(2,6,3) --> 'asdf','rtgyh','as'

random(1,5,2) --> 'd', 'olkp'

random(2,9,4) --> 'ed','tgyhujik','edsrfb','esd'

This are the steps that i have to follow:

**generate a random number C between a and b

**generate a random string of lenght C

**add c to the list

(please try to be as basic as possible)

this is what i tired:

import random,string
def casualis(w,k,n):
    l=[]
    l2=[]
    s=''
    a='abcdefghijklmnopqrstuvwxyz'
    while len(l)<(n+1):
        for i in range (w,k+1):
            l.append(random.randint(w,k))
            for j in range(l[0]):
                x=a[random.randint(1,25)]
                s+=x
    return l2