module Main where

import Control.Monad

low = -99999999
high = 99999999

fn :: Integer -> (Integer, Integer)
fn 0 = (0, 0)
fn x = iter 0 x
  where
    iter n y = case y `divMod` 10 of
        (q, 0) -> iter (n + 1) q
        (0, r) -> (r, n)
        (q, r) -> (q * 10 + r, n)

main :: IO ()
main = do
    [a, b] <- fmap read . words <$> getLine :: IO [Integer]
    let (aa, an) = fn a
    let (bb, bm) = fn b
    if (an >= 2)
        && (bm >= 2)
        && ((abs aa >= 1) && (abs aa <= 9))
        && ((abs bb >= 1) && (abs bb <= 9))
        then print $ a * b `div` 10
        else do
            let ans = a * b
            if (ans < low) || (high < ans)
                then putStrLn "E"
                else print ans