import sys
input=sys.stdin.readline
write=sys.stdout.write


T=int(input())
Ans=[0]*T
for t in range(T):
    A,B,C=map(int,input().split())

    alpha=(A%(10*B))*pow(10,C,10*B)
    Ans[t]=alpha//B%10

write("\n".join(map(str,Ans)))