#include<bits/stdc++.h>
using namespace std;
int main()
{
	char a[9];
	char b[9];
	int ha,ma,sa,hb,mb,sb,suma=0,sumb=0;
	cin>>a>>b;
	ha=(a[0]-'48')*10+(a[1]-'48');
	ma=(a[3]-'48')*10+(a[4]-'48');
	sa=(a[6]-'48')*10+(a[7]-'48');
	hb=(b[0]-'48')*10+(b[1]-'48');
	mb=(b[3]-'48')*10+(b[4]-'48');
	sb=(b[6]-'48')*10+(b[7]-'48');
	suma=ha*60*60+ma*60+sa;
	sumb=hb*60*60+mb*60+sb;
	cout<<suma-sumb;
 
 return 0;
 }

/**************************************************************
	Problem: 1101
	User: lzc
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/