using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string s1 ="MUT Mahanakorn2345";

        Console.WriteLine("{0}",s1);

        Console.WriteLine("Length = {0}",s1.Length);

        Console.WriteLine("Uppercase = {0}",s1.ToUpper());

        Console.WriteLine("Lowercase = {0}",s1.ToLower());

        Console.WriteLine("s1[0] = {0} : s1[1] = {1} : s1[2] = {2}",s1[0],s1[1],s1[2]);

        Console.Write("Arrey forward is ");

        for(int i=0;i<s1.Length;i++)

            Console.Write("{0}",s1[i]);

            Console.WriteLine();

        Console.Write("Arrey backward is ");

        for(int i=s1.Length-1;i>=0;i--)

            Console.Write("{0}",s1[i]);

            Console.WriteLine();

        Console.Write("Uppercase is ");

        int upper=0;

        for(int i=0;i<s1.Length;i++){

            if(s1[i]>='A' && s1[i]<='Z')

                upper++;

        }

            Console.Write("{0}",upper);

        Console.WriteLine();

        Console.Write("Lowercase is ");

        int lower=0;

        for(int i=0;i<s1.Length;i++){

            if(s1[i]>='a' && s1[i]<='z')

            lower++;

        }

            Console.Write("{0}",lower);

        Console.WriteLine();

        Console.Write("Number is ");

        int n=0;

        for(int i=0;i<s1.Length;i++){

            if(s1[i]>='0' && s1[i]<='9')

            n++;

        }

            Console.Write("{0}",n);

​

    }

}