#include<stdio.h>
int main()
{
printf("请输入a地时间_时_分\n") ;
printf("请输入b地时间_时_分\n");
int hour1,minute1;
int hour2,minute2;
int a,b,c,d,e;
scanf("%d %d",&hour1,&minute1);
scanf("%d %d",&hour2,&minute2);
a=minute1+hour1*60;
b=minute2+hour2*60;
c=a-b;
d=c/60;
e=d%60;
printf("时差为%d小时%d分",d,e);
return 0;
}