package main
import (
    "fmt"
    "sort"
    "math"
)

func min(a, b int) int {
    if a < b {
        return a
    }
    return b
}

func main() {
 //Enter your code here. Read input from STDIN. Print output to STDOUT
    var n int
    fmt.Scanf("%d",&n)
    
    var a = make([]int,n)
    for i := 0; i < n; i++{
        fmt.Scanf("%d",&a[i])    
    }
    
    sort.Ints(a)
    var minVal = int(math.Abs(float64(a[1]-a[0])))
    for i := 2 ; i != len(a); i++ {
        minVal = min(minVal, int(math.Abs(float64(a[i]-a[i-1]))))
    }
    fmt.Println(minVal)

}