#include<iostream>
#include<cstdio>
using namespace std;
int a,b,c,d;
float x;
main()
{
	scanf("%d %d UTC%f",&a,&b,&x);
	x=8.999-x;
	c=x;
	d=x*10-c*10;
	b=b-d*6;
	if(b<0)b+=60,a--;
	else if(b>=60)b-=60,a++;
	a=(a-c+24)%24;
	printf("%02d:%02d\n",a,b);
}