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

int cmpfunc (const void * a, const void * b)
{
   return ( *(int*)a - *(int*)b );
}

int main(){
    int n; 
    scanf("%d",&n);
    int *a = malloc(sizeof(int) * n);
    for(int a_i = 0; a_i < n; a_i++){
       scanf("%d",&a[a_i]);
    }

    qsort(a, n, sizeof(a[0]), cmpfunc);

    int min = 100000;
    for (int i = 0; i < n -1 ; i++)
    {
        int diff = abs((a[i] - a[i + 1]));
        if (diff < min)
            min = diff;
    }

    printf("%d", min);
    
    return 0;
}