import Control.Applicative
import Control.Monad
import System.IO
import Data.List


main :: IO ()
main = do
    n_temp <- getLine
    let n = read n_temp :: Int
    a_temp <- getLine
    let a = map read $ words a_temp :: [Int]
    putStrLn $ show $ minimum $ mapDiffs $ sort a where
        mapDiffs :: [Int] -> [Int]
        mapDiffs [] = []
        mapDiffs (x:[]) = []
        mapDiffs (x:y:zs) = [abs(x-y)] ++ mapDiffs (y:zs)

getMultipleLines :: Int -> IO [String]

getMultipleLines n
    | n <= 0 = return []
    | otherwise = do          
        x <- getLine         
        xs <- getMultipleLines (n-1)    
        let ret = (x:xs)    
        return ret