水题++

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    int hour=c-a,minute=d-b;//变量命名有技巧
    if(minute<0){//减法退位不要忘
		hour--;
		minute+=60;
	}
    cout<<hour<<" "<<minute;
    return 0;
}