
 () 
	
	=("");
	
	=(.(),".");
	=((.(),+1));
	
	.("");
	=.();
	 =1  .() 
		.(.().);
	;
	 =1  .() 
		.(.().);
	;
	 =1  .() 
		.(.().);
	;
	
	=(.());
	.(.());
	 .()=1 
		.();
		
		 .=1 
			.="+";
		 .=1 
			.="-";
		;
		
		 =2  .() 
			=.();
			=.();
			 ()="" 
				=();
			;
			.(.(),,);
		;
		
	;
	
	 ;

