题解 | #多组_字符串_T组形式#
多组_字符串_T组形式
https://www.nowcoder.com/practice/35f6f4e9173943e3b3f462b697fefd8b
import sys
# for line in sys.stdin:
# a = line.split()
# print(int(a[0]) + int(a[1]))
t = int(input())
for i in range(t):
n = int(input())
s = str(input())
print(s[::-1])
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