package main
import "fmt"
import "sort"

func getSlice(size int)[]int {
    var num int
    var numSlice []int
    
    for i := 0; i < size; i++ {
        fmt.Scan(&num)
        numSlice = append(numSlice, num)
    }
    
    return numSlice
}

func process(numSlice []int, size int){
    sort.Ints(numSlice)
    diff := 999999999
    var curDiff int
    
    for i := 1; i < size; i++ {
        curDiff = numSlice[i -1] - numSlice[i]
        if curDiff < 0 {
            curDiff *= -1 
        }
        
        if diff > curDiff{
            diff = curDiff
        }
       
    }
    
    fmt.Println(diff)
}

func main() {
 //Enter your code here. Read input from STDIN. Print output to STDOUT
    var size int
    fmt.Scan(&size)
    
    numSlice := getSlice(size)
    process(numSlice, size)
}