Problem:
Score : 100 points

Problem Statement

A string of length 6 consisting of lowercase English letters is said to be coffee-like if and only if its 3-rd and 4-th characters are equal and its 5-th and 6-th characters are also equal.

Given a string S, determine whether it is coffee-like.

Constraints

S is a string of length 6 consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If S is coffee-like, print Yes; otherwise, print No.

Sample Input 1

sippuu

Sample Output 1

Yes

In sippuu, the 3-rd and 4-th characters are equal, and the 5-th and 6-th characters are also equal.

Sample Input 2

iphone

Sample Output 2

No

Sample Input 3

coffee

Sample Output 3

Yes

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

/*
本宝的程序外人别想看！！

name: [夏宝宝]
run time：[] ms
compilation time: [] ms
output memory: [] MiB
where: []
state: []
*/
#include<bits/stdc++.h>
using namespace std;

inline int read()
{
	int s=0, w=1;

	char ch=getchar();

	while(ch<'0' || ch>'9')
	{
		if(ch='-')
		{
			w=-w;
		}

		ch=getchar();
	}

	while(ch>='0' && ch<='9')
	{
		s=(((s*10ll))+(ch-'0'));

		ch=getchar();
	}

	return s;
}

int main()
{
	//freopen(".in", "r", stdin);
	//freopen(".out", "w", stdout);
	
	cout.sync_with_stdio(false);
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	string s;
	
	cin>>s;
	
	if(s[2]==s[3])
	{
		if(s[4]==s[5])
		{
			cout<<"Yes"<<endl;
		}
		else
		{
			cout<<"No"<<endl;
		}
	}
	else
	{
		cout<<"No"<<endl;
	}
	
	return 0;
}