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

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in =new Scanner(new BufferedInputStream(System.in));
		while(in.hasNext())
		{
			BigInteger a = in.nextBigInteger(),b = in.nextBigInteger();
			System.out.println(a.subtract(b));
		}
		in.close();
	}

}
