from decimal import *
from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    T = int(input())
    for _ in [0] * T:
        A, B, C = map(int, input().split())
        getcontext().prec = C + 1
        x = str(Decimal(A) / Decimal(B)).split(".")
        if len(x[1]) < C:
            print(0)
        else:
            print(x[1][C - 1])


main()