#include<stdio.h>
#include<stdlib.h>
int main()
{
	//计算时间差
	int h1,h2,m1,m2;
	scanf("%d %d",&h1,&m1);
	 scanf("%d %d",&h2,&m2);
	int t1=h1*60+m1;
	int t2=h2*60+m2;
	int t=t1-t2;
	printf("%d小时%d分",t/60,t%60); 

	return 0;
}