#include <bits/stdc++.h>
using namespace std;
#define int              long long int
#define double           long double
#define print(a)         for(auto x : a) cout << x << " "; cout << endl
 
 
const int M = 1000000007;
const int N = 3e5+9;
const int INF = 2e9+1;
const int LINF = 2000000000000000001;
 
inline int power(int a, int b, int mod=M) {
    int x = 1;
    a %= mod;
    while (b) {
        if (b & 1) x = (x * a) % mod; 
        a = (a * a) % mod;
        b >>= 1;
    }
    return x;
}
 
 
//_ ***************************** START Below *******************************
 
 
 
 
vector<int> a;
 
int consistency(int a, int b){
	if(a==b) return 0;
 
	int x = 0;
	while(a%2==0){
		a /= 2;
		x++;
	}
 
	int y = 0;
	while(b%2 == 0){
		b /= 2;
		y++;
	}
 
	if(a != b) return -1;
 
	return (abs(x-y)+2)/3;
 
}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
int practice(int a, int b){
 
 
    return 0;
}
 
 
 
 
 
void solve() {
 
	int a, b;
	cin >> a >> b;
    cout << consistency(a, b) << endl;
 
 
}
 
 
 
 
 
int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
    int t = 1;
    cin >> t;
    while (t--) {
        solve();
    }
 
    return 0;
}

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