CF2067A Adjacent Digit Sums

You are given two numbers $ x, y $ . You need to determine if there exists an integer $ n $ such that $ S(n) = x $ , $ S(n + 1) = y $ . Here, $ S(a) $ denotes the sum of the digits of the number $ a $ in the decimal numeral system.

Each test contains multiple test cases. The first line contains the number of test cases $ t $ ( $ 1 \le t \le 500 $ ). The description of the test cases follows. The first line of each test case contains two integers $ x, y $ ( $ 1 \le x \le 1000, 1 \le y \le 1000 $ ).

For each test case, print "NO" if a suitable $ n $ does not exist. Otherwise, output "YES". You can output each letter in any case (for example, "YES", "Yes", "yes", "yEs", "yEs" will be recognized as a positive answer).

In the first test case, for example, $ n = 100 $ works. $ S(100) = 1 $ , $ S(101) = 2 $ . In the second test case, it can be shown that $ S(n) \neq S(n+1) $ for all $ n $ ; therefore, the answer is No. In the fourth test case, $ n = 10^{111}-1 $ works, which is a number consisting of $ 111 $ digits of $ 9 $ .