#include<bits/stdc++.h>
using namespace std;
int main()
{
	char o[9],a[9];
	cin>>o;
	cin>>a;
	int oh=(o[0]-'0')*10+(o[1]-'0');
	int om=(o[0]-'0')*10+(o[1]-'0');
	int os=(o[0]-'0')*10+(o[1]-'0');
	int ah=(a[0]-'0')*10+(a[1]-'0');
	int am=(a[0]-'0')*10+(a[1]-'0');
	int as=(a[0]-'0')*10+(a[1]-'0');
	cout<<(oh*3600+om*60+os)-(ah*3600+am*60+as);
	return 0;
}
/**************************************************************
	Problem: 1101
	User: houshanglin
	Language: C++
	Result: Wrong Answer
****************************************************************/