#include <stdio.h>
#include <stdlib.h>

#define ABS(a) ((a) > 0 ? (a) : -(a))

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 i = 0; i < n; i++)
        scanf("%d", &a[i]);
    
    qsort(a, n, sizeof(int), compare);
    
    unsigned int min = 0x7FFFFFFF;
    for (int i = 0; i < n - 1; i++)
        if (a[i + 1] - a[i] < min)
            min = a[i + 1] - a[i];
    
    printf("%d", min);
    return 0;
}