func_code_string: #include <bits/stdc++.h>   using namespace std;   const int SZ = 104;   const double EPS = 1e-7;   int a, b, c;   void read() { cin >> a >> b >> c; }   void solve() {     a -= a / b * b;     for (int i = 0; i < 1e5; ++i) {       a *= 10;       if (c == a / b) {         cout << i + 1;         return;       }       a -= a / b * b;     }     cout << -1;   }   signed main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     read();     solve();     return 0;   }   