#include<cstdio>
using namespace std;
int T,a,b;
char ch;
void read(){
	int x=0,y=0,flag=1;
	ch=getchar();
	if(ch=='-') flag=-1;else flag=1;
	ch=getchar();
	while(ch<='9'&&ch>='0') x=x*10+ch-'0',ch=getchar();
	if(ch=='.') {
		ch=getchar();
		while(ch<='9'&&ch>='0') y=y*10+ch-'0',ch=getchar();
	}
	x*=flag;y*=flag;
	if(x>=8) a+=(x-8),b+=y*6;
	else a+=(x-8+1),b-=(10-y)*6;
}
int main(){
	scanf("%d",&T);
	while(T--){
		scanf("%d%d",&a,&b);
		ch=getchar();
		ch=getchar();
		ch=getchar();
		ch=getchar();
		read();
		while(b<0) b+=60,a--;
		while(b>=60) b-=60,a++;
		while(a<0) a+=24;
		while(a>=24) a-=24;
		printf("%02d:%02d\n",a,b);
	}
}