using System;
using System.Collections.Generic;

public class Test
{
	public static void Main()
	{
	    string text="ABCD,ABCDABCD,ADCDS";
            string whatToFind = "BC";

            List<int> result = new List<int>();
            for(int index=0; index < text.Length; index++)
            {
                if(index + whatToFind.Length > text.Length)
                    break;
                bool matches = true;
                for(int index2=0; index2<whatToFind.Length; index2++)
                {
                    matches = text[index+index2] == whatToFind[index2];
                    if(!matches)
                        break;
                }
                if(matches)
                    result.Add(index);
            }
            foreach(int index in result)
                 Console.WriteLine(index);
	}
}