CountLetters

Write a Python program to

- Prompt user to input a sentence

- Count the occurrence of each letter in the input sentence

- Save the result to a dictionary letters where the key is the letter and the value is the occurrence of the key

- Display letters in alphabetical order of the key.

Program:

sentence = input('Enter a sentence: ')

newlist = []

for i in sentence:

i = i.lower()

if i not in newlist and i.isalpha():

newlist.append(i)

numlist = []

for ele in newlist:

count = 0

for alpha in sentence:

if ele == alpha.lower():

count += 1

numlist.append(count)

letters = {}

i = 0

while i <len(newlist):

letters[newlist[i]] = numlist[i]

i += 1

for n in letters:

print('{} : {}'.format(n, letters[n]))

Output:

Enter a sentence: hello

h : 1

e : 1

l : 2

o : 1