#include<bits/stdc++.h>
using namespace std;
int shijian(string k)
{
    int r;
    int h=(k[0]-'0')*10+(k[1]-'0');
    int m=(k[3]-48)*10+(k[4]-48);
    int s=(k[6]-48)*10+(k[7]-48);
    r=h*3600+m*60+s;
    return r;
}
int main()
{
    string s1,s2;
    cin>>s1>>s2;
    cout<<shijian(s1)-shijian(s2);
    return 0;
} 
/**************************************************************
	Problem: 1101
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2076 kb
****************************************************************/