```cpp
#include<iostream>
using namespace std;
int main()
{
int a,b,c,d,e=0,f=0;
cin>>a>>b>>c>>d;
for(int i=1;i<=c-a;i++)
{
e=c-a;
f=d-b;
if(d-b<0)
{
e=e-1;
f=60-b+d;
}
}
cout<<e<<" "<<f;
return 0;
}
```
by 市场花园行动 @ 2017-10-04 20:21:43