using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Let's match two strings.");

        Console.WriteLine("Enter first string to match:");

        string first = Console.ReadLine();

        Console.WriteLine("Enter second string to match:");

        string second = Console.ReadLine();         

        Console.WriteLine("Is it possible to match: {0}", IsMatchPossible(first, second) ? "Yes" : "No");

    }

    /// Scope to identify whether two string is possible to match with below condition; only **string1.

    /// 1. Capitalize 0 or more lowercase char from string1.

    /// 2. Delete all of the remaining lowercase char from string1.

    public static bool IsMatchPossible(string first, string second)

    {

        // Checks whether both are same already.

        if(string.Equals(first, second))

        {

            return true;

        }

        bool isMatchPossible = false;

        // Returns false if first string length is less.

        if(first.Length < second.Length)

        {

            return isMatchPossible;

        }

        // Check chars equal if length equals.

        else if(first.Length == second.Length)

        {

            return IsEqualChars(first, second);

        }

        else

        {

            // check chars equal.

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

            {

                isMatchPossible = i < second.Length 

                    ? (first[i] == second[i] || (Char.IsLower(first[i]) ? Char.ToUpper(first[i]) == second[i] : false)) 

                    : false;

                // remove remaining lowercase if not match.

                if(!isMatchPossible && Char.IsLower(first[i]))

                {

                    first = first.Remove(i, 1);

                }

            }

            // Check chars equal if length equals.

            if(first.Length == second.Length)

            {

                return IsEqualChars(first, second);

            }

        }              

        return isMatchPossible;

    }

    // Scope is to check equal chars.

    public static bool IsEqualChars(string first, string second)

    {

        bool isMatchPossible = false;

        if(first.Length == second.Length)

        {

            int i = 0;

            do

            {

                isMatchPossible = first[i] == second[i] || (Char.IsLower(first[i]) ? Char.ToUpper(first[i]) == second[i] : false);

                i++;

            }while(i < first.Length && isMatchPossible);

        }

        return isMatchPossible;

    }

}