def sign(n):
    if n < 0:
        return -1
    elif n > 0:
        return 1
    else:
        return 0

def is_valid(n):
    digits_sum = sum(int(d) for d in str(n))
    return digits_sum == int(str(n)[0])

A, B = [int(t) for t in input().split()]

sg = sign(A) * sign(B)
A = A if A >= 0 else -A
B = B if B >= 0 else -B

if is_valid(A) and is_valid(B):
    ans = sg * A * B
    if ans != 0 and str(ans)[-1] == '0':
        ans //= 10
    print(ans)
else:
    ans = sg * A * B

    if ans < -99999999 or ans > 99999999:
        ans = 'E'
    print(ans)