What is the resulting value of the variable sentence in this code snippet?

words $=[Mary,$ had, $a,$ little, lamb$]$

sentence $=str(words)$

Mary had a little lamb

Maryhadalittlelamb

$[\text{'}$Mary$\text{'},$ 'had', $\text{'}$a$\text{'},$ 'little', 'lamb'$]$

Mary, had, a$,$ little, lamb