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

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