package main

import "fmt"
import "sort"

func main() {
    var n, minDiff int
    minDiff = 90000000000
    fmt.Scanf("%d", &n)
    elements := make([]int, n)
    for i := 0; i < n;i++ {
        fmt.Scanf("%d", &elements[i])
    }
    sort.Ints(elements)
    
    for i := 0; i < n-1;i++ {
        diff := elements[i] - elements[i+1]
        if(diff < 0) {
            diff = 0 - diff
        }
        if(diff < minDiff) {
            minDiff = diff
        }
        if(minDiff == 0) {
            break
        }          
    }    
    fmt.Println(minDiff)
}