def func(list1):

list2 = []

list3 =[]

for i in list1:

str1 = i.lstrip()

str2 =str1.rstrip()

list2.append(str2)

for i in list2:

if (i.startswith('r') or i.startswith('R')) and i.endswith('x'):

list3.append(i)

print(list3)

list1 = [" Llez", " rlsx ", " Rwex ", " rlbz "]

func(list1)