n = int(input())
x = list(map(int, input().split()))

if n == 1:
    print(0)
else:
    ans = 10 ** 18
    x.sort()
    for i in range(n - 1):
        if x[i] == x[i + 1]: continue
        ans = min(ans, abs(x[i + 1] - x[i]))
    print(ans)