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 JAVA):

Solution:
import java.util.*;


public class Main {
	public static void main(String[] aargs) {
		Scanner sc = new Scanner(System.in);
		Map<String,Integer>A=new HashMap<>();
		int a=sc.nextInt();
		int q,x;
        String key;
		for(int i=0;i<a;i++) {
			q=sc.nextInt();
		if(q==0){
            key = sc.next();
                A.remove(key);
                 x = sc.nextInt();
            	A.put(key,x);
           
		}else if(q==1){
            key = sc.next();
            if(A.get(key)==null){
                System.out.println("0");
        }else{
                 System.out.println(A.get(key));
        }
		
	}else if(q==2){
             key = sc.next();
            A.remove(key);
}
        }
    }
}