#include <iostream>
#include <cstdio>
#include <cstring>
#define ll long long
using namespace std;
template <typename T>
void read(T &x) {
    x = 0; char c = getchar(); int f = 0;
    for (; !isdigit(c); c = getchar())
        f |= c == '-';
    for (; isdigit(c); c = getchar())
        x = x * 10 + (c ^ '0');
    if (f) x = -x;
}

template <typename T>
void write(T x, char ed = '\n') {
    if (x < 0) putchar('-'), x = -x;
    static short st[30], tp;
    do st[++tp] = x % 10, x /= 10; while (x);
    while (tp) putchar(st[tp--] | '0');
    putchar(ed);
}

int T;
ll a, b;
int main() {
    //freopen ("hs.in","r",stdin);
    for (read(T); T; --T) {
        read(a), read(b);
        if (a > b) swap(a, b);
        if (a == b && a >= 2) {
            write(2, ' '), write(a); continue;
        }
        ll mx = -1, mn = b;
        if (a * 2 <= b) mx = mn = b - a;
        for (ll l = 2, r;l <= a && l <= b; l = r + 1) {
            ll t1 = a / l, t2 = b / l;
            r = min(a / t1, b / t2);
            //printf ("l = %lld, r = %lld\n", l, r);
            //A - t1 * c = B - t2 * c
            if (t1 == t2) continue;
            ll tc = (a - b) / (t1 - t2);
            if (tc * (t1 - t2) != a - b || tc < l || tc > r) continue;
            if (tc > mx) mx = tc;
            if (tc < mn) mn = tc;
        }
        if (mx <= 1) write(-1, ' '), write(-1);
        else write(mn, ' '), write(mx);
    }
    return 0;
}