public class ExamStack{
	public static void huiWen(StringBuffer str) throws Exception{
		int n = str.length();
		SeqStack myStack = new SeqStack(n);
	
		for(int i = 0; i < n; i ++){
			myStack.push(str.substring(i,i+1));
		}
		StringBuffer str2=new StringBuffer();
		//str2.append((myStack.pop()).toString());
		while(myStack.notEmpty()){
			str2.append(myStack.pop());
			}	
		System.out.println(str);
		System.out.println(str2);
	}
	
	public static void main(String[] args){
		StringBuffer str111 =new StringBuffer("客上天然居");
		StringBuffer str112 =new StringBuffer("人過大佛寺");

		try{
			huiWen(str111);
			System.out.println();
			huiWen(str112);
		}
		catch(Exception e){
			System.out.println(e.getMessage());
		}
	}
}