Python Program:

Example:

c=input("Enter your character : ")
vowel=['a','e','i','o','u','A','E','I','O','U']

if (c in vowel) : 
  print("It's a vowel")
else :
  print("It's a consonant")

Output:

  Enter your character : E
  It's a vowel

You should know first :

Vowel alphabets: a, e, i, o, u

Consonant alphabets: Alphabets other than vowels

#Declaring all vowels in a lists
vowel=['a','e','i','o','u','A','E','I','O','U']

#Check for vowels both in uppercase & lowercase
if (c in vowel) : 
  #if true print vowel
else :
  #if false print consonant
  

OR

#Check for vowels both in uppercase & lowercase
if (c=='a' or c=='A' or c=='e' or c=='E' or c=='i' or c=='I' or c=='o' or c=='O' or c=='u' or c=='U') : 
  #if true print vowel
else :
  #if false print consonant