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 sys,collections as cl,bisect as bs
sys.setrecursionlimit(100000)
Max = sys.maxsize
def l(): #intのlist
	return list(map(int,input().split()))
def m(): #複数文字
	return map(int,input().split())
def onem(): #Nとかの取得
	return int(input())
def s(x): #圧縮
	a = []
	aa = x[0]
	su = 1
	for i in range(len(x)-1):
		if aa == x[i+1]:
			a.append([aa,su])
			aa = x[i+1]
			su = 1
		else:
			su += 1
	a.append([aa,su])
	return a
def jo(x): #listをスペースごとに分ける
	return " ".join(map(str,x))
def max2(x): #他のときもどうように作成可能
	return max(map(max,x))

n,m= m()

print(n-m)
