#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    long int n; 
    scanf("%ld",&n);
    long long int *a = malloc(sizeof(int) * n);
    for(long long int a_i = 0; a_i < n; a_i++){
       scanf("%lld",&a[a_i]);
    }
    long int i = 0;
    long long int smallestDiff = abs(a[1]-a[2]);
    for(i;i<n;i++){
        long int j=i+1;
        for(j;j<n-i;j++){
            long long int temp = abs(a[i]-a[j]);
            if(temp<smallestDiff){
                //printf("%d - %d = %d",a[i],a[j],temp);
                smallestDiff = temp;
            }
        }
    }
    printf("%lld", smallestDiff);
    // your code goes here
    return 0;
}