n = int(input())
l = [int(i) for i in input().split()]
l.sort()

min = 10000000

for i in range(len(l)-1):
    ans = l[i+1] - l[i]
    if ans != 0 and ans < min:
        min = ans

if max(l) == 0:
    print(0)
else:
    print(min)