func_code_string: #include <bits/stdc++.h>   using namespace std;   int a, b, c, d[100005];   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     cin >> a >> b >> c;     a = a % b;     d[a]++;     int t;     for (int i = 1; i <= 100005; ++i) {       t = a * 10 / b;       if (t == c) {         cout << i;         exit(0);       }       a = ((a * 10) % b);       d[a]++;       if (d[a] == 2) {         cout <<  -1 ;         exit(0);       }     }   }   