A, B = map(int, input().split())

def solve(A):
    for n in range(2, 10):
        q, r = divmod(A, 10 ** n)
        if r == 0 and 1 <= abs(q) <= 9:
            return True
    return False


if solve(A) and solve(B):
    print(A * B // 10)
else:
    C = A * B
    if -99999999 <= C <= 99999999:
        print(C)
    else:
        print("E")