#include <bits/stdc++.h>

using namespace std;

int n;
int a, b, c, d;

int hours, minutes;

void solve(){
    cin >> a >> b >> c >> d;
    if(a == 2 || b == 2 || c == 2 || d == 2){
        if(b == 2) swap(a, b);
        if(c == 2) swap(a, c);
        if(d == 2) swap(a, d);
    }
    else{
        if(a == 1 || b == 1 || c == 1 || d == 1){
            if(b == 1) swap(a, b);
            if(c == 1) swap(a, c);
            if(d == 2) swap(a, d);
        }
        else{
            int minimum = min(min(a, b), min(c, d));
            if(b == minimum) swap(a, b);
            if(c == minimum) swap(a, c);
            if(d == minimum) swap(a, d);
        }
    }
    int maksimum = max(b, max(c, d));
    if(c == maksimum) swap(b, c);
    if(d == maksimum) swap(b, d);
    if(c < d) swap(c, d);
    hours = 10*a+b;
    minutes = 10*c+d;
    if(minutes > 59 || hour > 24) cout << "ERROR";
    else cout << a << b << ":" << c << d;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    cin >> n;
    while(n>1){
        n--;
        solve();
        cout << "\n";
    }
    solve();
}