Help with python code.

Question

The code will correct the punctuations.

a =input("Enter your essay: ")
s= a.split ()

r = len(s)

for i in range(r):
print (s[i])
if(s[i] == "i"):
s[i]= s[i].replace ("i","I")
print (s)

s ="".join(s)
s = list(s)
r = len(s)
for i in range(r):
if (s[i] == "."):
s[i+1]= s[i+1].upper()

print (s)
#input = i am an idiot. but i am not a Bad.
#expected output = I am a idiot. But I am not bad.

Answer 1

sentence=input("Enter your essay:\n")
s= sentence.lower().split()

r = len(s)

for i in range(r):

if(s[i] == "i"):
s[i]= s[i].replace("i","I")

s =" ".join(s)

s = list(s.split())

r = len(s)
for i in range(r-1):
if ("." in s[i]):
s[i+1] = s[i+1].capitalize()
print(" ".join(s))

Answer 2

sentence=input("Enter your essay: ")
s= sentence .split ()

r = len(s)

for i in range(r):

if(s[i] == "i"):
s[i]= s[i].replace ("i","I")

s ="".join(s)
s = list(s)
r = len(s)
for i in range(r):
if (s[i] == "."):
s[i+1]= s[i+1].upper()
print (s)
#input = i am an idiot. but i am not a Bad.
#expected output = I am a idiot. But I am not bad.
This one

Answer 3

sentence=input("Enter your essay:\n")
s= sentence.lower().split()

r = len(s)

for i in range(r):

if(s[i] == "i"):
s[i]= s[i].replace("i","I")

s =" ".join(s)

s = list(s.split())

r = len(s)
for i in range(r-1):
if ("." in s[i]):
s[i+1] = s[i+1].capitalize()
print(" ".join(s))

# input :
# i am an idiot. but i am not a Bad.
# output :
# I am a idiot. But I am not bad.

#it can be shorten
# capitalize() function capitalize first letter only..
# reply if anything not understand!!
#hope it helps..