ed.cpp

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*/                              
#include<bits/stdc++.h>
using namespace std;
 
#define fastio ios_base::sync_with_stdio(0); cin.tie(0)
#define LL long long 
#define mod 1000000007 
#define FOR(i, j, k) for (int i=j ; i<k ; i++)
#define ROF(i, j, k) for (int i=j ; i>=k ; i--) 
#define debug(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false); debug("%s time : %.4fs", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))

const long long INF = 1e18;
const long long MAX = 1e5+10;

int main(){
    fastio;
    int t=1; cin>>t;
    while(t--){
        LL a,b; cin>>a>>b; if(a==b) {cout<<0<<"\n" ; continue;}
        LL a1=0,b1=0;
        while(a%2==0) a1++,a/=2;
        while(b%2==0) b1++,b/=2;
        if(a!=b) cout<<-1<<"\n";
        else {
            LL k =abs(a1-b1);
            LL ans= k/3; if(k%3>0) ans++;
            cout<<ans<<"\n";
        }
        //cout<<a1<<" "<<b1<<" "<<a<<" "<<b; 
    }
}