package main

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

var sc = bufio.NewScanner(os.Stdin)

func Scanner() string {
	sc.Scan()
	return sc.Text()
}
func main() {
	buf := make([]byte, 0)
	sc.Buffer(buf, 100000007)
	sc.Split(bufio.ScanWords)
	n, _ := strconv.Atoi(Scanner())
	x := make([]int, n)
	inm := 1145141919810
	for i := 0; i < n; i++ {
		x[i], _ = strconv.Atoi(Scanner())
	}

	ans := inm
	sort.Ints(x)
	for i := 0; i < n-1; i++ {
		if x[i] == x[i+1] {
			continue
		}
		ans = min(ans, abs(x[i]-x[i+1]))
	}
	if ans == inm {
		ans = 0
	}
	fmt.Println(ans)
}

func min(x int, y int) int {
	if x >= y {
		return y
	} else {
		return x
	}
}

func abs(n int) int {
	if n < 0 {
		return n * -1
	} else {
		return n
	}
}