#include<stdio.h>
#include<stdlib.h>
#include<string.h>

typedef struct TreeNode{
    char name[50];
    int score;
    struct TreeNode *left;
    struct TreeNode *right;
}Node;

node* createNode(char name[], int score){
    Node* node =(Node*)malloc(sizeof(Node));
    strcpy(node->name,name);
    node->score=score;
    node->left=NULL;
    node->right=NULL;
    return node;
}

Node*insert(Node* root,char name[],int score){
    if(root==NULL)
    return createNode(name,score);
    
    if(score<root->score)
    root->left=insert(root->left,name,score);
    else
    root->right=insert(root->right,name,score);
    
    return root;
}
void inorder(Node* root){
    if(root==NULL)return;
    inorder(root->left);
    printf("%s %d",root->name,root->score);
    inorder(root->right);
}

void preorder(Node* root){
    if(root==NULL)return;
    printf("%s %d",root->name,root->score);
    preorder(root->left);
    preorder(root->right);
}

void postorder(Node*root){
    if(root==NULL)return;
    postorder(root->left);
    postorder(root->right);
    printf("%s %d",root->name,root->score);
}
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    Node*root=NULL;
    
    for(int i=0;i<n;i++){
        char name[50];
        int score;
        scanf("%s %d",name,&score);
        root=insert(root,name,score);
    }
    inorder(root);
    printf("\n");
    
    preorder(root);
    printf("\n");
    
    postorder(root);
    return 0;
}