def g(a):
    while a % 10 == 0:
        a //= 10
    return a <= 9
def f():
    A, B = map(int, input().split())
    if A == 0 or B == 0:
        return "0"
    flg = True == g(abs(A)) and g(abs(B))
    ans = int(A) * int(B)
    if flg:
        return ans // 10
    if ans <= 1e8:
        return ans
    return "E"
print(f())