Long comparison

#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ld = long double;
const int INF = 1e9;

//ağ balqabaq boz balqabaq, boz balqabaq ağ balqabaq

void solve(){
    ll x1,p1; cin >> x1 >> p1;
    ll x2,p2; cin >> x2 >> p2;
    if(x1 == x2){
        if(p1 == p2) cout << "=";
        else if(p1 > p2) cout << ">";
        else cout << "<";
    } else if(x1 > x2){
        //2 hal ola biler. ölçüləri bərabər
        //ölçüləri fərqli
        //y'in ölçüsü böyük ola bilməz. Çünki x1 > x2
        string s = to_string(x1);
        string ss = to_string(x2);
        ll x = (ll)s.size();
        ll y = (ll)ss.size();
        if(x == y){
            if(p1 >= p2) cout << ">";
            else cout << "<";
            return;
        } else if(x > y){
            ll z = x - y;
            if(p2 - p1 < z){
                cout << ">";
            } else if(p2 - p1 > z){
                cout << "<";
            } else {
                //p2 - p1 == z -> yəni ki, ölçülər bərabər
                for(ll i = 0;i<(ll)ss.size();++i){
                    char ch = s[i];
                    char chh = ss[i];
                    ll xx = ch - '0';
                    ll yy = chh - '0';
                    if(xx > yy){
                        cout << ">";
                        return;
                    } else if(xx < yy){
                        cout << "<";
                        return;
                    }
                }
                cout << "=";
            }
        }
    } else if(x1 < x2){
        string s = to_string(x1);
        string ss = to_string(x2);
        ll x = (ll)s.size();
        ll y = (ll)ss.size();
        if(x == y){
            if(p1 <= p2) cout << "<";
            else cout << ">";
            return;
        } else if(x < y){
            ll z = y - x;
            if(p1 - p2 < z){
                cout << "<";
            } else if(p1 - p2 > z){
                cout << ">";
            } else {
                //p1 - p2 == z
                for(ll i = 0;i<(ll)s.size();++i){
                    char ch = s[i];
                    char chh = ss[i];
                    ll xx = ch - '0';
                    ll yy = chh - '0';
                    if(xx > yy){
                        cout << ">";
                        return;
                    } else if(xx < yy){
                        cout << "<";
                        return;
                    }
                }
                cout << "=";
                return;
            }
        }
    }
}

int main(){
    cin.tie(0) -> sync_with_stdio(0);
    cin.exceptions(cin.failbit);
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    int t = 1; cin>>t;
    while(t--){
        solve();
        cout << "\n";
    }
    return 0;
}