#yuki722

a,b=map(int,raw_input().split())
x,y=abs(a),abs(b)
sa,sb=str(x),str(y)
if x<=10 or y<=10:
 print a*b
elif sa[0]!='0' and sb[0]!='0' and sa.count('0')==len(sa)-1 and sb.count('0')==len(sb)-1:
 print a*b/10
else:
 if -99999999<=a*b<=99999999:
  print a*b
 else:
  print 'E'