a, b = map(int, input().split())

aa = a
bb = b
a0, b0 = 0, 0
while True:
    if aa % 10 != 0:
        if not (-9 <= aa <= 9):
            a0 = 0
            break
    if bb % 10 != 0:
        if not (-9 <= bb <= 9):
            b0 = 0
            break
    if not (-9 <= aa <= 9):
        aa //= 10
        a0 += 1
    if not (-9 <= bb <= 9):
        bb //= 10
        b0 += 1
    if -9 <= aa <= 9 and -9 <= bb <= 9:
        break

if a0 >= 2 and b0 >= 2:
    print(a * b // 10)
else:
    ans = a * b
    if not (-99999999 <= ans <= 99999999):
        ans = 'E'
    print(ans)