#!/usr/bin/env pypy3


CALC_LIMIT = 99999999


def by_hand(x, y):
    return x * y // 10


def by_calc(x, y):
    res = x * y
    if abs(res) > CALC_LIMIT:
        return None
    else:
        return res


def judge(x):
    x = abs(x)
    n = 0
    while x % 10 == 0:
        x //= 10
        n += 1
    return 1 <= x <= 9 and n >= 2


def solve(x, y):
    if judge(x) and judge(y):
        res = by_hand(x, y)
    else:
        res = by_calc(x, y)
    return res


def main():
    x, y = (int(z) for z in input().split())
    res = solve(x, y)
    if res is None:
        print("E")
    else:
        print(res)


if __name__ == '__main__':
    main()