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

if any(A % (10 ** n) == 0 for n in range(2, 10)) and \
   any(B % (10 ** n) == 0 for n in range(2, 10)):
    print(A * B // 10)
else:
    C = A * B
    if -99999999 <= C <= 99999999:
        print(C)
    else:
        print("E")