题解 | #多组_带空格的字符串_T组形式#

import sys

input = sys.stdin.read
data = input().split("\n")

index = 0
t = int(data[index])
index += 1

results = []

for _ in range(t):
    n = int(data[index])
    index += 1
    s = data[index]
    index += 1

    # 去掉空格并倒置字符串
    s = s.replace(" ", "")  # 去掉所有空格
    reversed_s = s[::-1]  # 倒置字符串

    results.append(reversed_s)

# 输出所有结果，每个结果一行
sys.stdout.write("\n".join(results) + "\n")