six = input() a,b,c,d,e,f = int(six[0]),int(six[1]),int(six[2]),int(six[3]),int(six[4]),int(six[5]), c = (a+b+c)%10 f = sum( [a,b,c,d,e,f])%10 a = chr( a + 65 ) if b % 2 == 0: b = b//2 e = ( e + ord('l') + ord('e') )//10 %10 print("{}{}{}{}{}{}".format(a,b,c,d,e,f))