read a read b echo "\ [${a:$(expr ${#a}-1):1}]dSaSa [${b:$(expr ${#b}-2):2}]ddSbSbSb \ [Lrc1]Sr[LrcLbx0=r]SrLbZ1=r \ [Lrc0]Sr[LrcLax0=r]Srz0=r \ [Lrc4Sb]Sr[LrcLbx4%d0=rSbLrc]Srz0=r \ [LaxLb^10%]Srz0=r \ n10P \ " | dc