# -*- coding:utf-8 -*-
# @Author len
# @Create 2023/12/14 21:09


def find_two_sum_indices(nums, target_sum):
    # 创建一个字典来存储数组值到索引的映射
    num_to_index = {}
    for index, num in enumerate(nums):
        # 计算当前数字与目标和的差
        difference = target_sum - num
        if difference in num_to_index:
            # 如果差值在字典中，返回对应的索引和当前索引
            return [num_to_index[difference], index]
        num_to_index[num] = index
    # 如果没有找到，则返回空列表
    return []

# 假设的输入
array_length = int(input())
array = list(map(int, input().split(" ")))
specific_sum = int(input())

# 查找和为特定值的两个索引
result_indices = find_two_sum_indices(array, specific_sum)

# 输出结果
print(result_indices)