public class Ex13_5
{
    private String main;
    private String smaller;
    public Ex13_5(String main)
    {
        this.main=main;
        smaller = main;
    }

    public boolean find(String t)
    {
        if(main.length() < t.length())
            return false;
        else if(main.substring(0, t.length()).equals(t))
            return true;
        else 
        {
            main = main.substring(1);
            return find(t);
        }

    }

    public int indexOf(String s)
    {
        if(!find(s))
        return -1;
        else
        {
            if(smaller.substring(0, s.length()).equals(s))
                return 1;
            else
            {
                smaller = smaller.substring(1);
                return 1+ indexOf(s);
            }
        }
        
        

    }

}