（暑假集训个人训练赛5）数字比较D - A==B？(15p)

Give you two numbers A and B, if A is equal to B, you should print “YES”, or print “NO”.
Input
each test case contains two numbers A and B.
Output
for each case, if A is equal to B, you should print “YES”, or print “NO”.
Sample Input
1 2
2 2
3 3
4 3
Sample Output
NO
YES
YES
NO
思路：没给数据范围，用字符串比较，把后面对0都去掉；