import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]

def main():
    input()
    xx = LI()
    xx.sort()
    ans = 10 ** 7
    for x0, x1 in zip(xx, xx[1:]):
        if 0 < x1-x0 < ans: ans = x1-x0
    if ans==10**7:print(0)
    else:print(ans)
main()