n = int(input())

numList = list(map(int, input().split()))
numList = sorted(numList)

min
for i in range(n):
    if (i == n - 1):
        break
    elif i == 0:
        # 初回の場合　無条件で最小値を代入
        min = abs(numList[i] - numList[i + 1])
        continue;
    elif min > abs(numList[i] - numList[i + 1]):
        min = abs(numList[i] - numList[i + 1])

print(min)