a, b = [int(_) for _ in input().split()]

c = abs(a)
d = abs(b)

c = list(str(c))
d = list(str(d))

x = 0
if '1' in c:
    if c.count('1') == 1:
        x = 1
else:
    x = 2

y = 0
if '1' in d:
    if d.count('1') == 1:
        y = 1
else:
    y = 2

e = sorted(list(set(c)))
f = sorted(list(set(d)))

if a != 10 and b != 10 and x != 0 and y != 0 and 1 <= int(e[-1]) <= 9 and 1 <= int(f[-1]) <= 9 and len(e) == len(f) == 2:
    g = a * b
    print(g//10)
else:
    h = a * b
    if -99999999 <= h <= 99999999:
        print(h)
    else:
        print('E')