N = int(input())
x = list(map(int,input().split()))
i = 0
min = 0

while i <= N-1:
	if x[i+1] > x[i]:
		r = x[i+ 1] - x[i]
	else:
		r = x[i] - x[i+1]
		
	if i == 0 or (i < 0 and r < min):
		min = r
	i += 1
		
print(min)