#ifdef MY_LOCAL
#include "D://competitive_programming/debug/debug.h"
#define debug(x) cerr << "[" << #x<< "]:"<<x<<"\n"
#else
#define debug(x) 
#endif
#define REP(i, n) for(int i = 0; i < (n); i ++)
#define REPL(i,m, n) for(int i = (m); i < (n); i ++)
#define SORT(arr) sort(arr.begin(), arr.end())
#define LSOne(S) ((S)&-(S))
#define sz(X) ((int)X.size())
#define READ(arr) for(auto &a: arr){cin>>a;}
#define SUM(arr) accumulate((arr).begin(), (arr).end(), 0LL)
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long ll;
#define int ll
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<vii> vvii;
typedef tree<int,null_type,less<int>, rb_tree_tag, tree_order_statistics_node_update> ost;
const ll INF = 1e18;
void solve() {
	int n;cin>>n;
	vector<pair<string, string>> vec(n);
	REP(i, n) {
		string a,b;cin>>a>>b;
		vec[i] = {a,b};
	}
	int bst = INF;
	tuple<int,int,int> ans;
	REP(a, 7) {
		REP(b, 7) {
			map<string, int> cter;
			int mx = 0;
			for (auto [x,y]:  vec) {
				string rr = x.substr(0, a) + y.substr(0, b); 
				cter[rr]++;
				mx = max(cter[rr], mx);
			}
			int needed = 0;
			int tot = 1;
			while (tot < mx) {
				tot *= 10;
				needed++;
			}
			if (a + b + needed < bst) {
				ans = {a,b,needed};
				bst = a + b + needed;
			}
		}
	}
	auto [a,b,c] = ans;
	cout<<a<<" "<<b<<" "<<c<<"\n";

}

signed main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL); 
	int tc;
	cin>>tc;
	REP(i, tc) {
		solve();
	}

}