using System;

public class Program

{

    public static int vowels(string str,bool n){

        int vowel=0;

        int county=0;

        for(int i=0;i<str.Length;i++){

                 if (str[i] == 'a' || str[i] == 'e' || str[i] =='i' || str[i] == 'o' || str[i] == 'u')

            {

                vowel++;

            }

                if(str[i] == 'y'){

                    county++;

                }

            }

        if(n==true){

            return vowel+county;

        }else{

            return vowel;

        }

    }

    public static bool palindrome(string s){

​

    int l = 0;

    int h = s.Length - 1;

    while (h > l)

​

    {

​

        if (s[l++] != s[h--])

​

        { //not a palindrome

​

            return false;

​

        }

​

    }

//string is palindrome

    return true;

​

}

    public static int duplicate(string input){

        int count = 0;

        while (input.Length > 0){

                for (int j = 0; j < input.Length; j++){

​

                    if (input[0] == input[j]) {

                        count++;

                    }

                }

                input = input.Replace(input[0].ToString(),string.Empty);               

            }

        return count;

    }

    public static void Main()

    {

        string str;

        int count=0;

            Console.Write("Enter a string - ");

            str = Console.ReadLine();

            for(int i=0;i<str.Length;i++){

                count++;

            }

        Console.WriteLine("The string length: {0}", count);

            int vowelcount = vowels(str,false);

        Console.WriteLine("The number of vowels: {0} ", vowelcount);

        int vowelcounty = vowels(str,true);

        Console.WriteLine("The number of vowels(include y): {0} ", vowelcounty);

            if(palindrome(str)){

                Console.WriteLine("The String is Palingdrome");

            }else{

                Console.WriteLine("The String is Not Palingdrome");

            }

        int dupli = duplicate(str);

        Console.WriteLine("The number of duplicate value: {0}", dupli);

            //Console.WriteLine("You entered '{0}'", testString);

    }

}