import java.io.*;
public class Search1
{
  public static void main(String args[])
 { 
   int count=0,first=0,second=0;
   String text="ab cd ef g"; 
   String s="";
   String subtext=text;
   System.out.println(text);
   System.out.println("请输入你要查找的字符串:");
   try
  {
    BufferedReader in=new BufferedReader(new InputStreamReader    (System.in));
    s=in.readLine();
  }
  catch(IOException e){}
  for(int i=1;i<=text.length();i+=second+1)
 {
   second=subtext.indexOf("");
   String temp=subtext.substring(first,second);
   if(s.equalsIgnoreCase(temp)) count++;
   subtext=subtext.substring(second+1);
 }

  
  if(count==0)
  System.out.print("it not exists");
  else
  System.out.print("it exists");
 }
}