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

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

   
//int size = sizeof a / sizeof *a;
    qsort(a,n,sizeof(n),cmpfunc);
    int min=INT_MAX;
    for(int i=0; i<n-1; i++){
          if (a[i+1] - a[i] < min){
          min = a[i+1] - a[i];
        min=abs(min);
    }
    }
        printf("%d",min);
    
    // your code goes here
    return 0;
}