#include <bits/stdc++.h>
using namespace std;
int main(){
	char a[10],b[10];
	scanf("%s%s",&a,&b);
	int h1=(a[0]-'0')*10+(a[1]-'0');
	int m1=(a[3]-'0')*10+(a[4]-'0');
	int s1=(a[6]-'0')*10+(a[7]-'0');
	
	int h2=(b[0]-'0')*10+(b[1]-'0');
	int m2=(b[3]-'0')*10+(b[4]-'0');
	int s2=(b[6]-'0')*10+(b[7]-'0');
	
	int t1=h1*3600+m1*60+s1,t2=h2*3600+m2*60+s2;
	cout<<t1-t2;
	return 0;
	}

/**************************************************************
	Problem: 1101
	User: fzy001
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/