package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
)

func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	t, _ := strconv.Atoi(sc.Text())
	return t
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	N := nextInt(sc)
	X := make([]int, N)
	for i := 0; i < N; i++ {
		X[i] = nextInt(sc)
	}
	sort.Ints(X)
	ans := 0
	if N > 1 {
		ans = int(1e7) + 1
		for i := 1; i < N; i++ {
			ans = min(ans, X[i]-X[i-1])
		}
	}
	fmt.Println(ans)
}
func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}