Q=lambda o,O:Q(o+1,P([O[1],o*o*O[0]+(2*o+1)*O[1],O[3],o*o*O[2]+
(2*o+1)*O[3]]));P=lambda O:O[0]//O[2]==O[1]//O[3]and(sys.stdout
.write("0123456789ABCDEF"[O[0]//O[2]]),P([16*(O[0]%O[2]),16*(O[
1]%O[3])]+O[2:]))[1]or O;import sys;Q(2,[4,12,1,4])#tokigun2004