Problem $4$: Assign the list $[\text{'}$a$\text{'},\text{'}$b$\text{'},\text{'}$c$\text{'},\text{'}$d$\text{'},\text{'}$e$\text{'}]$ to a variable. Reverse the list, then insert $\text{'}$z$\text{'}$ at index $3,$ and finally append $\text{'}$o$\text{'}$ to the end.