import Foundation

func readInt() -> Int { return Int(readLine()!)! }
func readIntArray() -> [Int] { return readLine()!.components(separatedBy: " ").map{ Int($0)! } }


// input
let n = readInt()
let xs = readIntArray().sorted()


// solution
let ys = xs.dropFirst()
let diffs = zip(ys, xs).map({ $0.0 - $0.1 })
let r = diffs.min()!


// output
print(r)