????????
      ----------
NRPTC ) QCWWQTTM
       -NRPTC
        =====
        RQYRWT
       -RYNJXT
        ======
         JTWCUT
        -JQMXTQ
         ======
          YRJYYM
         -YUURCR
          ======
          ??????

base: 12
symbols: CJMNPQRTUWXY
difficulty: medium