Problem: For a dictionary $M$ that stores elements formed by a pair of a string key and an integer value, perform a sequence of the following operations. Note that each key in $M$ must be unique.

* insert($key$, $x$): Insert an element formed by a pair of $key$ and $x$ to $M$.
* get($key$): Print the value with the specified $key$. Print 0 if there is no such element.
* delete($key$): Delete the element with the specified $key$.

Constraints

* $1 \leq q \leq 200,000$
* $1 \leq x \leq 1,000,000,000$
* $1 \leq $ length of $key$ $ \leq 20$
* $key$ consits of lower case letters

Input

The input is given in the following format.


$q$
$query_1$
$query_2$
:
$query_q$


Each query $query_i$ is given by


0 $key$ $x$


or


1 $key$


or


2 $key$


where the first digits 0, 1 and 2 represent insert, get and delete operations respectively.

Output

For each get operation, print an integer in a line.

Example

Input

8
0 blue 4
0 red 1
0 white 5
1 red
1 blue
2 red
1 black
1 red


Output

1
4
0
0

Solution (in PYTHON3):

Solution:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# FileName: 	map_delete
# CreatedDate:  2020-07-15 11:23:30 +0900
# LastModified: 2020-07-15 11:29:50 +0900
#


import os
import sys
# import numpy as np
# import pandas as pd


def main():
    q = int(input())
    dictionary = {}
    for _ in range(q):
        command = list(input().split())
        if command[0] == '0':
            dictionary[command[1]] = int(command[2])
        elif command[0] == '1':
            if command[1] in dictionary.keys():
                print(dictionary[command[1]])
            else:
                print(0)
        else:
            if command[1] in dictionary.keys():
                del dictionary[command[1]]



if __name__ == "__main__":
    main()