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//创建二叉树和三种遍历,输入序列如 1 5 8 0 0 0 6 0 0 
#include <stdio.h>
#include <iostream>
using namespace std;


struct Node{
	int data;
	Node* left;
	Node* right;
};

Node* create(void){
	int x;
	cin>>x;
	if(x==0){
		return NULL;
	}
	Node *T = new Node;
	T->data = x;
	T->left = create();
	T->right =create(); 
	
	
}
 
void preOrder(Node * T){
	if(T==NULL)
		return;
	cout<<T->data<<' ';
	preOrder(T->left);
	preOrder(T->right);
}
 
void midOrder(Node * T){
	if(T==NULL)
		return;
	midOrder(T->left);
	cout<<T->data<<' ';
	midOrder(T->right);
}
 
void postOrder(Node * T){
	if(T==NULL)
		return;
	
	postOrder(T->left);
	postOrder(T->right);
	cout<<T->data<<' ';
}
 
 
int main(){
	//Node* root = new Node;
	Node * root =create();
	preOrder(root);
	printf("\n");	
	midOrder(root);
	printf("\n");
	postOrder(root);
	
	return 0;
}//创建二叉树和三种遍历,输入序列如 1 5 8 0 0 0 6 0 0