def main():
    num = int(input())
    values = map(int, input().split())
    set_values = set(values)
    sorted_values = sorted(list(set_values))
    min_difference = 0
    for i in range(len(sorted_values) - 1):
        difference = abs(sorted_values[i+1] - sorted_values[i])
        if min_difference == 0 or difference < min_difference:
            min_difference = difference

    print(min_difference)



if __name__ == '__main__':
    main()