// No.135 とりあえず1次元の問題
package main

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

var sc = bufio.NewScanner(os.Stdin)
var wr = bufio.NewWriter(os.Stdout)

func next() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, _ := strconv.Atoi(next())
	return i
}

func nextFloat() float64 {
	f, _ := strconv.ParseFloat(next(), 64)
	return f
}

func nextInts(n int) []int {
	ret := make([]int, n)
	for i := 0; i < n; i++ {
		ret[i] = nextInt()
	}
	return ret
}

func nextFloats(n int) []float64 {
	ret := make([]float64, n)
	for i := 0; i < n; i++ {
		ret[i] = nextFloat()
	}
	return ret
}

func nextStrings(n int) []string {
	ret := make([]string, n)
	for i := 0; i < n; i++ {
		ret[i] = next()
	}
	return ret
}

func main() {
	sc.Split(bufio.ScanWords)
	var n = nextInt()
	var x = nextInts(n)
	sort.Ints(x)
	ans := math.MaxInt64
	for i := 1; i < n; i++ {
		diff := int(math.Abs(float64(x[i]) - float64(x[i-1])))
		if diff > 0 {
			ans = min(ans, diff)
		}
	}
	if ans == math.MaxInt64 {
		fmt.Println(0)
	} else {
		fmt.Println(ans)
	}
}