import math

input_list = list(map(int,input().split()))
a, b = input_list

len_a = len(str(a))
len_b = len(str(b))

if '-' in str(a):
    len_a -= 1
if '-' in str(b):
    len_b -= 1
    
head_a = a / 10 ** (len_a - 1)
head_b = b / 10 ** (len_b - 1)
calculator = 0
res = None

if len_a >= 3 and len_b >= 3:
    if math.floor(head_a) == math.ceil(head_a) and math.floor(head_b) == math.ceil(head_b):
        calculator = 1
        res = int(a * b / 10)

if calculator == 0:
    if a * b >= -99999999 and a * b <= 99999999:
        res = a * b
    else:
        res = 'E'
        
print(res)