#include<bits/stdc++.h>
using namespace std;
int main(){
  char e,f;
  int h,m,s,a,b,c,x,y,z,n;
  cin>>h>>e>>m>>f>>s;
  cin>>a>>e>>b>>f>>c;
  x=(h-a)*3600;
  y=(m-b)*60;
  z=s-c;
  cout<<x+y+z;


return 0;
}

/**************************************************************
	Problem: 1101
	User: wtq001
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/