Byte Stuffing - Computer Networks | Python3

list1=[]
flag='@'
esc='/'
a=input('Enter your message=')
list1.append(flag)
len1=len(a)
for i in a:
if i=='@':
list1.append(esc)
list1.append(i)
else:
list1.append(i)
list1.append(flag)
print ('At senders side=',list1)
len1=len(a)
list2=[]
del list1[0],list1[len(list1)-1]
for i in range(0,len1,1):
if a[i]=='#':
list1.remove('#')
else:
list2.append(a[i])
print ('At recievers side=',list2)

ScreenShot: