n = int(input())

a = list(map(int,input().split()))

#最值 排序
#1. 暴力法 枚举所有n 【计算差的绝对值】
a.sort()

min_diff = float('inf')

for i in range(n-1):
    diff = a[i+1] - a[i]
    if diff < min_diff :
        min_diff = diff
print(min_diff)




#无穷大设置 float('inf)
#0到n-2 的代码 for i in range (n-1)