using System;

public class Program

{

    public static void Main()

    {

        int[] r =new int[500];

        int t=0;

        string arr = "if you injoy on you'r life it 1 2 is good to be 5 kindly 4 w 6 i th 7 , 9 you'r post office 10 , it is 13 ";

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

        {           

            if(isNumber( arr[i]))

            {

                r[t]=arr[i];

                t++;

            }

            foreach(var item in r)

            {

                Console.WriteLine(item);        

            }           

        }

    }

    static bool isNumber(char val)

    {

        try{

            int x=  int.Parse(val.ToString());  

            return true;

        }

    catch {

        return false;

    }

}