#include<bits/stdc++.h>
using namespace std;
int shijian(string s)
{
	int r;
	int h=(s[0]-'0')*10+(s[1]-'0');
	int m=(s[3]-'0')*10+(s[4]-'0');
	int e=(s[6]-'0')*10+(s[7]-'0');
	r=h*3600+m*60+e;
	return r;
}
int main()
{
	string s1,s2;
	cin>>s1>>s2;
	cout<<shijian(s1)-shijian(s2);
}
/**************************************************************
	Problem: 1101
	User: wangyuxin
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/