def f(n):
  if n==0:return 0
  c=0
  while n%10==0:
    c+=1
    n//=10
  return c

a,b=map(int,input().split())
c,d=f(a),f(b)
e,f=a//(10**c),b//(10**d)

if 1<=abs(e)<=9 and 1<=abs(f)<=9 and c>=2 and d>=2:
  print(a*b//10)
else:
  res=a*b
  if abs(res)<10**8:
    print(res)
  else:
    print("E")