func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = 0x3f3f3f3f;   int main() {     int t;     cin >> t;     while (t--) {       long long a, b;       cin >> a >> b;       int tmp = b + 1;       long long len = -1;       while (tmp != 0) {         tmp /= 10;         len++;       }       long long ans = a * len;       cout << ans << endl;     }     return 0;   }   