Difference of Big Integers

Given two integers $A$ and $B$, compute the difference, $A - B$.

Input

Two integers $A$ and $B$ separated by a space character are given in a line.

Output

Print the difference in a line.

Constraints

* $-1 \times 10^{100000} \leq A, B \leq 10^{100000}$



Sample Input 1


5 8


Sample Output 1


-3


Sample Input 2


100 25


Sample Output 2


75


Sample Input 3


-1 -1


Sample Output 3


0


Sample Input 4


12 -3


Sample Output 4


15






Example

Input

5 8


Output

-3

import java.math.BigInteger;
import java.util.Scanner;

public class Main 
{

	public static void main(String[] args) 
	{
		Scanner sc = new Scanner(System.in);
		BigInteger a = new BigInteger(sc.next());
		BigInteger b = new BigInteger(sc.next());
		
		a = a.subtract(b);
		a = a.abs();
		
		System.out.println(a);
	}

}

