#描述#
Their are two set A and B，each element x in A or B satisefy 1 ≤ x ≤ 10^9，A and B both have not more than 15000 elements。We want to find the ralationship between A and B 。You only need to make sure how many elements in B but not in A。

#格式#
##输入格式##
Their are more than one case。
The first line :Two integers N，M，means the second line has N element in A，The third line has M element in B。

##输出格式##
one integer means the number of elements in B but not in A.

#样例1#
##样例输入1##

2 1
1 2
1

##样例输出1##

0

#限制#
1000ms
32768KB

#提示#

#来源#