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

int n, a, b; 
string s; 

void fast_io(void){
    ios_base :: sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

void sol(void){
    cin >> n;
    while(n--){
        cin >> a >> b >> s; 
        if(s[3] == '+'){
            int time, diff = 0, idx = 0; 
            
            while(idx < s.size() && s[idx] != '.') idx++; 
            
            if(idx < s.size()){
                diff += 60 * stoi(s.substr(4, idx - 4)); 
                diff += 60 * stoi(s.substr(idx+1)) / 10; 
            }
            else{
                diff += 60 * stoi(s.substr(4)); 
            }
            diff -= 60 * 8; 
            
            time = (60 * a + b + diff + 1440)%1440;
            
            if((time/60) < 10) cout << "0"; 
            cout << time/60;  
            cout << ":"; 
            if((time%60) < 10) cout << "0"; 
            cout << time%60 << "\n";
        }
        else{
            int time, diff = 0, idx = 0; 
            
            while(idx < s.size() && s[idx] != '.') idx++; 
            
            if(idx < s.size()){
                diff -= 60 * stoi(s.substr(4, idx - 4)); 
                diff -= 60 * stoi(s.substr(idx+1)) / 10; 
            }
            else{
                diff -= 60 * stoi(s.substr(4)); 
            }
            diff -= 60 * 8; 
            
            time = (60 * a + b + diff + 1440)%1440;
            if((time/60) < 10) cout << "0"; 
            cout << time/60;  
            cout << ":"; 
            if((time%60) < 10) cout << "0"; 
            cout << time%60 << "\n";
        }
    }
}

int main(void){
    fast_io(); 
    sol(); 
}