n = int(input())

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

min
for i in range(n):
    if (i == n - 1):
        break

    val = abs(numList[i] - numList[i + 1])
    print("min =")
    print(min)
    if i == 0:
        # 初回の場合　無条件で最小値を代入
        min = val
        continue;
    elif val == 0 and min > abs(val):
        min = val

print(min)