def is_ok(x: int) -> bool:
    if x == 0:
        return False
    t = str(abs(x))[1:]
    return 2 <= len(t) == t.count("0")


def main():
    a, b = map(int, input().split())
    if is_ok(a) and is_ok(b):
        print(a * b // 10)
    elif abs(a * b) < 100000000:
        print(a * b)
    else:
        print("E")


if __name__ == "__main__":
    main()