#!/bin/python
import sys
n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))

b = sorted(a)
min_diff = float("inf")
for i in range(n-1):
    if abs(b[i]-b[i+1]) < min_diff:
        min_diff = abs(b[i]-b[i+1])
print min_diff