/* Binary Search Tree <Delete> */
#include <stdio.h>
#include <stdlib.h>

struct node
{
    struct node *par;
    struct node *left;
    struct node *right;
    int key;
};

typedef struct node * NodePointer;

void init(void);
NodePointer makenode(int);
void insert(int, NodePointer);
void preorder(NodePointer);
void inorder(NodePointer);
NodePointer find(int, NodePointer);
void delete_node(NodePointer);
NodePointer tree_successor(NodePointer);
NodePointer tree_minimum(NodePointer);

NodePointer head, tail;

int main()
{
    char str[7];
    int i, n, k;
    NodePointer x;

    init();
    scanf("%d", &n);
    for(i=0; i<n; i++){
        scanf("%s", str);
        if(str[0] == 'i'){
            scanf("%d", &k);
            insert(k, head);
        } else if(str[0] == 'p'){
            inorder(head -> right);
            puts("");
            preorder(head -> right);
            puts("");
        } else if(str[0] == 'f'){
            scanf("%d", &k);
            if(find(k, head -> right) != NULL){
                printf("yes\n");
            } else{
                printf("no\n");
            }
        } else{
            scanf("%d", &k);
            x = find(k, head -> right);
            delete_node(x);
        }
    }
    return 0;
}

void init()
{
    head = makenode(-1);
    tail = makenode(-1);
    head -> par = head;
    head -> right = tail;
    head -> left = tail;
}

NodePointer makenode(int k)
{
    NodePointer x;

    x = malloc(sizeof(struct node));
    x -> key = k;
    x -> left = x -> right = tail;

    return x;
}

void insert(int k, NodePointer p)
{
    if(k < p -> key){
        if(p -> left == tail){
            p -> left = makenode(k);
            p -> left -> par = p;
        } else{
            insert(k, p -> left);
        }
    } else{
        if(p -> right == tail){
            p -> right = makenode(k);
            p -> right -> par = p;
        } else{
            insert(k, p -> right);
        }
    }
}

void preorder(NodePointer node)
{
    if(node != tail){
        printf(" %d", node -> key);
        preorder(node -> left);
        preorder(node -> right);
    }
}

void inorder(NodePointer node)
{
    if(node != tail){
        inorder(node -> left);
        printf(" %d", node -> key);
        inorder(node -> right);
    }
}

NodePointer find(int k, NodePointer node)
{
    if(node == tail){
        return NULL;
    }

    if(node -> key == k){
        return node;
    } else if(node -> key < k){
        return find(k, node -> right);
    } else{
        return find(k, node -> left);
    }
}

void delete_node(NodePointer node)
{
    NodePointer x, y;
    if(node -> left == tail || node -> right == tail){
        y = node;
    } else{
        y = tree_successor(node);
    }

    if(node -> left != tail){
        x = y -> left;
    } else{
        x = y -> right;
    }

    if(x != tail){
        x -> par = y -> par;
    }
    if(y -> par == tail){
        node -> par = x;
    } else if(y == y -> par -> left){
        y -> par -> left = x;
    } else{
        y -> par -> right = x;
    }

    if(y != node){
        node -> key = y -> key;
    }
}

NodePointer tree_successor(NodePointer x)
{
    NodePointer y;

    if(x -> right != tail){
        return tree_minimum(x -> right);
    }

    y = x -> par;
    while(y != tail && x == y -> right){
        x = y;
        y = y -> par;
    }
    return y;
}

NodePointer tree_minimum(NodePointer x)
{
    while(x -> left != tail){
        x = x -> left;
    }
    return x;
}


Measured memory_bytes: 20520