func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       unsigned long long a, b;       cin >> a >> b;       if (max(a, b) % min(a, b)) {         cout << -1 << endl;         continue;       }       int dem = 0;       long long p = max(a, b) / min(a, b);       while (p != 1) {         if (p % 8 == 0) {           dem++;           p /= 8;         } else if (p % 4 == 0) {           dem++;           p /= 4;         } else if (p % 2 == 0) {           dem++;           p /= 2;         } else {           dem = -1;           break;         }       }       cout << dem << endl;     }   }   