#41 백준 파이썬 [2675] 문자열 반복

https://www.acmicpc.net/problem/2675

#Solution

from sys import stdin

case_number = int(input())
test_case = stdin.readlines()
total_test = []

for i in test_case:
    test = list(i.split())
    test_num = int(test[0])
    test_sample = str(test[1])

    test_result = []

    for k in test_sample:
        print(k * test_num, end="")
    print("")