# import pypyjit;pypyjit.set_param("max_unroll_recursion=-1")
import os
import sys

# from bisect import *
# from collections import *
# from datetime import *
# from decimal import *  # PyPyだと遅い
# from heapq import *
from itertools import *

# from math import gcd, lcm
# from random import *
# from string import *

# import numpy as np
# from atcoder.dsu import *
# from atcoder.segtree import *
# from more_itertools import *
# from sortedcontainers import *

# sys.setrecursionlimit(10**7)  # PyPyは呪文を付ける
# sys.set_int_max_str_digits(0)
INF = 1 << 61
MOD = 998244353
# MOD = 10**9 + 7
IS_ATCODER = os.getenv("ATCODER", 0)

File = sys.stdin


def input():
    return File.readline().replace("\n", "")


# ///////////////////////////////////////////////////////////////////////////


for _ in range(int(input())):
    M = int(input())
    d = list(map(int, input().split()))
    l = []
    for i, j in enumerate(d, 1):
        if j:
            l.append(str(i) * j)
    n = int("".join(l) + "0" * 9)
    n += n % M
    print(n)