using System;

using System.Linq;

using System.Collections.Generic;

using System.Text;

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/*

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****************This is optimized Solution *****************

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Link: [https://www.scaler.com/academy/mentee-dashboard/class/26141/assignment/problems/10697?navref=cl_tt_nv]

Problem Description

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You are given a function to_upper() consisting of a character array A.

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Convert each charater of A into Uppercase character if it exists. If the Uppercase of a character does not exist, it remains unmodified.

The lowercase letters from a to z is converted to uppercase letters from A to Z respectively.

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Return the uppercase version of the given character array.

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Problem Constraints

1 <= |A| <= 105

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Input Format

Only argument is a character array A.

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Output Format

Return the uppercase version of the given character array.

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Example Input

Input 1:

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 A = ['S', 'c', 'A', 'L', 'E', 'r', 'A', 'c', 'a', 'D', 'e', 'm', 'y']

Input 2:

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 A = ['S', 'c', 'a', 'L', 'e', 'R', '#', '2', '0', '2', '0']

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Example Output

Output 1:

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 ['S', 'C', 'A', 'L', 'E', 'R', 'A', 'C', 'A', 'D', 'E', 'M', 'Y']

Output 2:

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 ['S', 'C', 'A', 'L', 'E', 'R', '#', '2', '0', '2', '0']

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Example Explanation

Explanation 1:

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 All the characters in the returned array are in uppercase alphabets.

*/                  

public class Program

{

    private static List<char> Solve_to_Upper(List<char> A)

    {

        int charLength = A.Count;

        List<char> toLowerList = new List<char>();

        for(var i = 0; i < charLength; i++){

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

                char temp = (char)(A[i] - 32);

                A[i] = temp;

            }

        }

        return A;

    }

    public static void Main()

    {

        //List<char> charList = new List<char>(){ 'S', 'c', 'A', 'l', 'e', 'r', 'A', 'c', 'a', 'D', 'e', 'm', 'y' };

        List<char> charList = new List<char>(){ 'S', 'c', 'a', 'L', 'e', 'r', '#', '2', '0', '2', '0' };

        List<char> ConvertedLowerCaseCharacters = Program.Solve_to_Upper(charList);

        Console.WriteLine("After Sorting: " + string.Join(" ", ConvertedLowerCaseCharacters));

    }

}