B"Several months later Alex finally got his brother Bob's creation by post. And now, in his turn, Alex wants to boast about something to his brother. He thought for a while, and came to the conclusion that he has no ready creations, and decided to write a program for rectangles detection. According to his plan, the program detects if the four given segments form a rectangle of a positive area and with sides parallel to coordinate axes. As Alex does badly at school and can't write this program by himself, he asks you to help him. The input data contain four lines. Each of these lines contains four integers x1, y1, x2, y2 ( xe2 x80 x89- xe2 x80 x89109 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89x1, xe2 x80 x89y1, xe2 x80 x89x2, xe2 x80 x89y2 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89109) -- coordinates of segment's beginning and end positions. The given segments can degenerate into points. Output the word xc2 xabYES xc2 xbb, if the given four segments form the required rectangle, otherwise output xc2 xabNO xc2 xbb."...