Input

　　输入只有一行，包括两个正整数M, N (1<= M <= N <= 20)，分别表示wlnwyyfc是第几个报数的和总的人数。







Output

　　从小到大顺序用二进制输出所有wlnwyyfc需要报的数字和需要略过的数字，每个数字一行。最大输出到11111111(2)。如果一个数字需要略过，在那一行输出"pass"(不包含引号)。

-Input input only a single line, including two positive integers M, N (1 < = M < = N < = 20), respectively wlnwyyfc is the first of several newspaper and the total number of numbers. Output from small to large in order to use the binary output of all wlnwyyfc must report the number of and the need to skip the figures, each digital line. Maximum output to 11111111 (2). If you need to skip a number in the line output " pass"　(without the quotes).