Well this is a simple program written in python which asks user to input sentence and the code will count the number of vowel letter in the sentence. What each steps do, I have clearly written out by commenting just above the line of code.
#To ask for input from user
Sentence=input("Enter a sentence: ")
#To convert the user input sentence to lower case
Lower_case_sentence=Sentence.lower()
#To print the lower case sentence
print(Lower_case_sentence)
vowel_list=['a','e','i','o','u']
#initializing the count variable to 0
count=0
for alphabet in Lower_case_sentence:
#For checking if the character in the user input sentence is in vowel_list defined above
if alphabet in vowel_list:
#Incrementing the count by 1 if vowel letter found in the user input sentence
count=count+1
#To print the number of vowel letter in the sentence netered by the user
print("The number of vowels in given sentence is: ",count)
The output when I executed this program is as follows. I recheck the program again because it shows the correct output in the very first attempt haha.

Run this code online here.
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