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

ans = float('inf')

for i in range(n-1):
    d = x[i+1] - x[i]
    if d != 0 and d < ans:
        ans = d

if max(x) == 0:
    print(0)
else:
    print(ans)