时间限制

400 ms

内存限制

65536 kB

代码长度限制

16000 B

判题程序

Standard

作者

CHEN, Yue

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 (< 10^{5}) and D (1 < D <= 10), you are supposed to tell if N is a reversible prime with radix D.

**
Input Specification:
**

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.

**
Output Specification:
**

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

73 10 23 2 23 10 -2

Yes Yes No