A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a reversible prime because its reverse 37 is also a prime. Now given any two positive integers N (5 ) and D (1 D = 10), you are supposed to tell if N is a reversible prime with radix D.

输入描述:

The input file consists of several test cases. Each case occupies a line which contains two integers N and D. The input is finished by a negative N.

输出描述:

For each test case, print in one line "Yes" if N is a reversible prime with radix D, or "No" if not.