#include<bits/stdc++.h> using namespace std; int a,b,c,a2,b2,c2; int main(){ scanf("%d:%d:%d",&a2,&b2,&c2); scanf("%d:%d:%d",&a,&b,&c); printf("%d",(a3600+b60+c)-(a23600+b260+c2)); return 0; }