Vasya long wondered \textbf{n}-dimensional space. On the math class he had been told that the lines in three dimensional space can be the same, to be parallel, intersect or cross. After the lesson the teacher secretly told me that in \textbf{n}-dimensional space all the same. Vasya wants to define as a direct lie, given two points. \InputFile For each set of input contains an integer \textbf{n} (\textbf{2} ≤ \textbf{n} ≤ \textbf{50}) --- the dimension of space. Further written \textbf{n} numbers - the coordinates of the points \textbf{p_1}, then \textbf{n} numbers - the coordinates of \textbf{p_2}, then --- \textbf{p_3} and \textbf{p_4}. All coordinates are integers, not exceeding modulo \textbf{2000}. Numbers separated by spaces and/or linefeed. Input end input \textbf{n} = \textbf{0}. Number of input patterns does not exceed \textbf{10^4}. \OutputFile For each set of input output relative position of lines. If the lines intersect output "\textbf{cross}", crossed - "\textbf{skew}", parallel to - "\textbf{parallel}", are the same - "\textbf{equal}". Each word is displayed on a separate line.