f	U+0066     Latin Small Letter F
a	U+0061     Latin Small Letter A
n	U+006E     Latin Small Letter N
k	U+006B     Latin Small Letter K
4 characters

  
___________   ____________________
           \ |
            \|

                         
        /\________/\
    |  /____    ____\  |
    | //    \  /    \\ |
    [{|      ||      |}]
      \\____/  \____//
       \    ____    /
    _   \   \__/   /   _
    \\  /\_______ /\  //
     \\IPDUUHHHHUUDPI//