B"The New Vasjuki village is stretched along the motorway and that's why every house on it is characterized by its shift relative to some fixed point -- the xi coordinate. The village consists of n houses, the i-th house is located in the point with coordinates of xi. TELE3, a cellular communication provider planned to locate three base stations so as to provide every house in the village with cellular communication. The base station having power d located in the point t provides with communication all the houses on the segment [t xe2 x80 x89- xe2 x80 x89d, xe2 x80 x89t xe2 x80 x89+ xe2 x80 x89d] (including boundaries). To simplify the integration (and simply not to mix anything up) all the three stations are planned to possess the equal power of d. Which minimal value of d is enough to provide all the houses in the village with cellular communication. The first line contains an integer n (1 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89n xe2 x80 x89 xe2 x89 xa4 xe2 x80 x892 xc2 xb7105) which represents the number of houses in the village. The second line contains the coordinates of houses -- the sequence x1, xe2 x80 x89x2, xe2 x80 x89..., xe2 x80 x89xn of integer numbers (1 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89xi xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89109). It is possible that two or more houses are located on one point. The coordinates are given in a arbitrary order. Print the required minimal power d. In the second line print three numbers -- the possible coordinates of the base stations' location. Print the coordinates with 6 digits after the decimal point. The positions of the stations can be any from 0 to 2 xc2 xb7109 inclusively. It is accepted for the base stations to have matching coordinates. If there are many solutions, print any of them."...