#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
	int a,b,c,d;
	int shi=0,fen=0;
	scanf("%d%d%d%d",&a,&b,&c,&d);
	if (b>d) {shi=c-a-1;fen=d+60-b;} 
	if (b<=d) {shi=c-a;fen=d-b;} 
	printf("%d%d",&shi,&fen); 
	return 0;
 }