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

if -100 < a < 100 or -100 < b < 100:
    print(a*b)
else:
    if a * b < 0:
        f = -1
    else:
        f = 1
    A = abs(a)
    B = abs(b)

    if int(A)%(10**(len(str(A)) - 1)) == 0 and int(B)%(10**(len(str(B)) -1)) == 0:
        ans = str(int(A)*int(B))
        if ans == '1':
            if f == -1:
                print('-1')
            else:
                print('1')
        else:
            if f == -1:
                ans = "-"+ans
            print(ans[:-1])
    else:
        ans = a * b 
        if -99999999 <= ans <= 99999999:
            print(ans)
        else:
            print('E')