Write a program that prompts the user to input a sequence of characters and outputs the number of vowels.(Use the function isVowel written in Programming Exercise 2.)Your output should look like the following:There are # vowels in this sentence where # is the number of vowels. here is what i have so far:#include #include using namespace std;//functions declaredbool isVowel(char ch);int main (){string letters;int num = 0;int len;cout<<"Enter a sequence of characters: ";getline(cin, letters);len = letters. length();for (int i = 0; i < len; i++){if (isVowel(letters[i]))num++;}if (num == 0)cout << "There were 0 vowels.\n";else if (num == 1)cout << "There was 1 vowel.\n";elsecout << "There were " << num << " vowels.\n";//this keeps the prompt console from closingsystem ("pause");// this adds butter to the potatoesreturn 0;}// closing main function// function to identify vowelsbool isVowel(char ch){// make it lower case so we don't have to compare// to both 'a' and 'A', 'e' and 'E', etc. char ch2 = tolower(ch);if (ch2 == 'a' || ch2 == 'e' || ch2 == 'i' || ch2 == 'o' || ch2 == 'u')return true;elsereturn false;}