#include<stdio.h>
#include<stdlib.h>
int asc(const void* a, const void* b)
{
	return  *(int*)a - *(int*)b;
}
int abs(int n)
{
	if (n < 0)
		n *= -1;
	return n;
}
int main()
{
	int n;
	scanf("%d", &n);
	int i;
	int x[100005];
	for (i = 0; i < n; i++)
		scanf("%d", &x[i]);
	qsort(x, n, sizeof(int), asc);
	if (x[0] == x[n - 1])
	{
		printf("0\n");
		return 0;
	}
	int min = 10000007;
	for (i = 0; i < n - 1; i++)
		if (x[i] != x[i + 1])
			if (min > abs(x[i] - x[i + 1]))
				min = abs(x[i] - x[i + 1]);
	printf("%d\n", min);
	return 0;
}