#include<bits/stdc++.h>
using namespace std;
int main(){
	string s1,s2;
	int a1,b1,c1,a2,b2,c2;
	cin>>s1>>s2;
	a1=(s1[0]-'0')*10+(s1[1]-'0');
	b1=(s1[3]-'0')*10+(s1[4]-'0');
	c1=(s1[6]-'0')*10+(s1[7]-'0');
	a2=(s2[0]-'0')*10+(s2[1]-'0');
	b2=(s2[3]-'0')*10+(s2[4]-'0');
	c2=(s2[6]-'0')*10+(s2[7]-'0');
	cout<<a1*3600+b1*60+c1-(a2*3600+b2*60+c2);	
	

	return 0;
}

/**************************************************************
	Problem: 1101
	User: zhuanghaoxiang
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2076 kb
****************************************************************/