System.out.println("how many studnt you have in your class?");
		int num = Integer.parseInt(br.readLine());
		
		String shortName = "";
		String longName = "";
		
		for (int i=0; i<num; i++){
			System.out.println("what is the name of student? ");
			String name =br.readLine();
			
			if (name.length()>longName.length()){
				longName=name;
			}
			if (name.length()<shortName.length()){
				shortName=name;
			}
		}
	    System.out.println("the long name is"+longName);
	    System.out.println("the short name is"+shortName);
	}
}

System.out.println("how many studnt you have in your class?");
		int num = Integer.parseInt(br.readLine());
		
		String shortName = "";
		String longName = "";
		
		for (int i=0; i<num; i++){
			System.out.println("what is the name of student? ");
			String name =br.readLine();
		
			if (name.length()>longName.length()){
				longName = name;
			}
			if (name.length()<shortName.length()|| shortName.length()==0){
				
				shortName = name;
			}
		}
	    System.out.println("the long name is"+longName);
	    System.out.println("the short name is"+shortName);
	}
}