using System.CodeDom.Compiler;

using System.Collections.Generic;

using System.Collections;

using System.ComponentModel;

using System.Diagnostics.CodeAnalysis;

using System.Globalization;

using System.IO;

using System.Linq;

using System.Reflection;

using System.Runtime.Serialization;

using System.Text.RegularExpressions;

using System.Text;

using System;

​

public class Program

{   

    public static string ClearDigits(string s) {

        string digits = new String(s.Where(Char.IsDigit).ToArray());

        int index = 0;

​

        //Removes all digits in s until we have none left

        while(!s.All(char.IsLetter))

        {

            int digitIndex = s.IndexOf(digits[index]);

            int left = digitIndex;

            int right = digitIndex;

​

            //Removes the closest non-digit from the left or right of this digit

​

            while (Char.IsDigit(s[left]))

            {

                --left;

                if(left <= 0)

                {

                    left = Int16.MaxValue;

                    break;

                }

            }

​

            while (Char.IsDigit(s[right]))

            {

                ++right;

                if(right >= s.Length)

                {

                    right = Int16.MaxValue;

                    break;

                }

            }

            Console.WriteLine(left + " " + right);

            //Removes the digit and the non-digit from s

            s = s.Remove(Math.Min(left, right), 1);

            s = s.Remove(digitIndex - 1, 1);           

        }

​

        return s;

    }

    public static void Main()

    {

        string s = "cb34";

        Console.WriteLine(ClearDigits(s));

        //SquareNums(p, q);

        //kaprekarNumbers(p, q);

    }

}