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

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')