int countX=0;
int countY=0;
string tmp=x;
for(countX=1;countX<=x.lenth();countX++)
{
  for(countY=1;countY<=y.length();countY++)
  {
    if x.substring(1,countX).Equels(y.substring(1,countY)
    {
      tmp=tmp.Replace(tmp.substring(1,countX),"");
    }
  }
}
x=tmp;

'e'and 'o'

x="hello", y="open"
so we have to remove e and o from x, so its hll

class Stringb
{

	public static void main(String a[])
	{
	StringBuffer sb=new StringBuffer("Hello");
	StringBuffer sb1=sb.deleteCharAt(1);
	StringBuffer sb2=sb1.deleteCharAt(3);
	System.out.println(sb2);
	}
}

public static void main(String[] args) {
		String str_x = "hello";
		String str_y = "open";
		
		StringBuffer result = new StringBuffer();
		
		for (int i=0; i<str_x.length();i++){
			if (str_y.indexOf(str_x.charAt(i)) < 0) 
				result.append(str_x.charAt(i));
		}
		
		System.out.print(result);
	}

Public  abstract ClassDemo
{
public static void main(string args[]){
StringBuffer sb1= new stringBuffer("Hello");
StringBuffer sb2= new stringBuffer("open");
stringbuffer a= sb.deletecharacterAt("hello",1);
system.out.println("the value of a:"+a);
stringBuffer x=sb.deletecharacterAt("hllo"3);
system.out.println(x:+"x");
}

static public string StupidQuestion(string x, string y)
{
    StringBuilder sb = new StringBuilder();
    Hashtable ht = new Hashtable();

    // just one pass through y
    foreach( char c in y.ToCharArray() )
        if( !ht.Contains(c) )
               ht.Add(c, c)

    // just one pass thru x
    foreach( char c in x.ToCharArray() )
        if( !ht.Contains(c) )
          sb.Append(c);

    return sb.ToString();
}

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "mohim";
            string str1 = "mo";
            remove(str, str1);
        }
        private static void remove(string str,string str1)
        {
            char[] abc;
            abc = str.ToCharArray();
            char[] bcd;
            string str4 = "";
            bcd = str1.ToCharArray();
            for (int i = 0; i < bcd.Length; i++)
            {
                for (int j = 0; j < abc.Length; j++)
                {
                    if (abc[j] != bcd[i])
                    {
                        
                       str4 = str4 + abc[j];
                    }
                }
                abc = str4.ToCharArray();
                str4 = "";
            }
            Console.Write(abc);
            Console.ReadLine();

        }
    }
}