import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	X = list(sorted(getlist()))
	if N == 1:
		print(0)

	ans = INF
	for i in range(N - 1):
		if X[i + 1] != X[i]:
			ans = min(ans, X[i + 1] - X[i])

	if ans != INF:
		print(ans)
	else:
		print(0)



if __name__ == '__main__':
	main()