func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, A, B;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cin >> n;     while (n--) {       cin >> A >> B;       cout << A * (long long)log10(B + 1) << endl;     }   }   