#include <bits/stdc++.h>
using namespace std;
 
// Speed
#define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
 
// Typedefs
#define int long long
#define pb push_back
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((int)(x).size())
#define endl '\n'
 
// Loops
#define rep(i,a,b) for(int i=a;i<b;++i)
#define each(x, a) for (auto &x : a)
 
// Logic
void solve() {
    int a, b;
        cin >> a >> b;
 
        int a1 = a, b1 = b;
        int A = 0, B = 0;
        while ((a1 % 2) == 0) { a1 /= 2; ++A; }
        while ((b1 % 2) == 0) { b1 /= 2; ++B; }
 
        if (a1!= b1) {
            cout << -1 << '\n';
 
        	return;
        }
 
        int d = B - A;
        int absd = d >= 0 ? d : -d;
        int ans = absd / 3 + (absd % 3 ? 1 : 0);
        cout << ans << '\n';
}
 
// Main
int32_t main() {
    fast_io;
    int t;
    cin>>t;
    while (t--) solve();
    return 0;
}
 

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11 44
17 21
1 1
96 3
2 128
1001 1100611139403776
1000000000000000000 1000000000000000000
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10 8