link "../ilib/structs"

procedure main()
   while s := read() do {
      write(s)
      a := ltree(s)
      write(depth(a))
      write(stree(a))
      b := tcopy(a)
      if eq(a,b) then write("eq okay") else write("eq failed")
      if teq(a,b) then write("teq okay") else write("teq failed")
      every write(stree(visit(a)))
      }
end