休息的时间

#include<bits/stdc++.h>
using namespace std;
int main(){
	int h1,m1,h2,m2,s=0,x=0,v=0;
	int g,mp;
	char m;
	cin>>h2>>m>>m2>>h1>>m>>m1;
	s=(h2*60)+m2;
	x=(h1*60)+m1;
	v=s-x;
	g=v/60/60;
	mp=v/60%60;
	if(g==0) cout<<"00"<<":";
	else if(g<10) cout<<"0"<<g<<":";
	else cout<<g<<":";
	
	if(mp==0) cout<<"00";
	else if(mp<10) cout<<"0"<<mp;
	else cout<<mp;
	return 0;
}