import Foundation

let count = Int(readLine()!)!
let countsLine = readLine()!
let numbers = countsLine.components(separatedBy: " ").map { Int($0)! }
var sorted = numbers.sorted() { $0 < $1 }
var minDif = Int.max

for i in 0..<(count - 1) {
	let dif = abs(sorted[i] - sorted[i + 1])
	if dif < minDif { minDif = dif }
}

print("\(minDif)")