Write the following function. remove$\_$letter$($queue$1$: ListQueue, letter: str$)$ ListQueue: remove$\_$letter$()$ function removes the given letter from the given ListQueue. If the letter is not in the queue, do nothing. Test case: queue$1$: $$a$,$b$,$c$,$d$,$e$,$ letter: $$d$$ This function should return $$a$,$b$,$c$,$e$.$

$(**$By the way we have to use this way to solve the problem$**$:

class LinkedQueue:

def $\_\_$init$\_\_($self$)$:

#underlying data structure is a linked list

self.queue $=$ LinkedList$()$

$"""$return the number of elements in this queue"""

def $\_\_$len$\_\_($self$)$:

return self.queue.$\_\_$len$\_\_()$

$"""$return True if empty, False otherwise"""

def is$\_$empty$($self$)$:

return self.queue.is$\_$empty$()$

$"""$return front element"""

def first$($self$)$:

return self.queue.first$()$

$"""$add e to the back of the queue"""

def enqueue$($self$,$ e$)$:

self.queue.add$\_$last$($e$)$

$"""$remove and return the front element"""

def dequeue$($self$)$:

return self.queue.remove$\_$first$()$

$"""$return a string representation of this queue"""

def $\_\_$str$\_\_($self$)$:

return self.queue.$\_\_$str$\_\_()$

class ListQueue:

def $\_\_$init$\_\_($self$)$:

#underlying data structure is a list

self.queue $=$ list$()$

$"""$return the number of elements in this queue"""

def $\_\_$len$\_\_($self$)$:

return len$($self$.$queue$)$

$"""$return True if empty, False otherwise"""

def is$\_$empty$($self$)$:

return len$($self$.$queue$)==0$

$"""$return front element"""

def first$($self$)$:

if self.is$\_$empty$()$:

return None

return self.queue$[0]$

$"""$add e to the back of the queue"""

def enqueue$($self$,$ e$)$:

self.queue.append$($e$)$

$"""$remove and return the front element"""

def dequeue$($self$)$:

if self.is$\_$empty$()$:

return None

return self.queue.pop$(0)$

$"""$return a string representation of this queue"""

def $\_\_$str$\_\_($self$)$:

return str$($self$.$queue$)$

if $\_\_$name$\_\_==\text{'}\_\_$main$\_\_\text{'}$:

q$1=$ LinkedQueue$()$

for e in $[1,2,3,4,5]$:

q$1.$enqueue$($e$)$

print$($q$1)$

while not q$1.$is$\_$empty$()$:

q$1.$dequeue$()$

print$($q$1)$

q$2=$ ListQueue$()$

for e in $[1,2,3,4,5]$:

q$2.$enqueue$($e$)$

print$($q$2)$

while not q$2.$is$\_$empty$()$:

q$2.$dequeue$()$

print$($q$2)$