func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MOD = 1e9 + 7;   const int MAXN = 1e6 + 50;   const int INF = 0x3f3f3f3f;   void bf(int A, int B) {     for (long long a = 1; a <= A; a++)       for (long long b = 1; b <= B; b++) {         if ((a * b + a + b) == stol(to_string(a) + to_string(b)))           cout << a <<     << b << endl;       }   }   int main() {     int cs;     while (cin >> cs) {       while (cs--) {         int a, b;         cin >> a >> b;         long long ret = to_string(b + 1).size() - 1;         cout << a * ret << endl;       }     }     return 0;   }   