A path in some Unix-similar file system is given. The path consists of elements separated with characters " / ". For example: " /usr/share/mysql/../tomcat6/conf/server.xml ". The path starts with the root directory (i.e. starts with the character " / "). Each element means a name of file or directory, or it is one of two special elements: " . " или " .. ". First of them stands for the current directory (for example, path " /./usr/././share " is equal to " /usr/share "). The second element " .. " stands for the moving to the parent directory (for example, path " /usr/share/../lib " is equal to " /usr/lib "). You task is to convert the given path to such a path, which doesn't contain special elements " . " and/or " .. ". If it is impossible, print " -1 ". The only reason for it is an attempt to move to the parent directory from the root. The only line contains the given path. The path starts with " / " and consists of elements separated with " / ". No two " / " follow one after another (consecutively). The only path which can end with " / " is the root directory path equal to " / ". Each element may contain " a "-" z ", " 0 "-" 9 " and dots. Any element different from specials " . " and " .. " contains at least one character different from the dots. The path length is between 1 and 1000 inclusively. Print the required path or " -1 ".