int main(){
int x=0,y=0;
while(cin>>x>>y){
x+=2;
y+=30;
if(y>59){
y-=60;
x+=1;
if(x>23){
x-=24;
}
}
if(x<10(填入判別符號)y<10){
if(y<10){
if(x<10) cout << "0" <<x <<":0"<<y<<"\n";//x,y都單位數
else cout <<x <<":0"<<y<<"\n"; //x雙位數 y單位數
}else{
cout <<"0"<<x <<":"<<y<<"\n"; //x單位數 Y雙位數
}
}else cout <<x <<":"<<y<<"\n"; //x,y 都雙位數
}
}