N = int(input())
l = list(map(int, input().split()))

l.sort()
ans = 1000000000000000000

for i in range(N - 1):
    if l[i + 1] - l[i] != 0:
        if ans >= l[i +1] -l[i]:
            ans = l[i + 1] - l[i]
print(ans)