import sys,random,bisect
from collections import deque,defaultdict
from heapq import heapify,heappop,heappush
from itertools import permutations
from math import log,gcd

input = lambda :sys.stdin.readline().rstrip()
mi = lambda :map(int,input().split())
li = lambda :list(mi())

for _ in range(int(input())):
    a,b,c = mi()
    
    res = (a * pow(10,c,10*b))
    print((res//b)%10)