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 Rust (1.15.1) (judge verdict: Accepted)

pub struct Scanner{
    line : Vec<String> ,
    idx : usize
}

impl  Scanner{
   #[allow(dead_code)]
   fn new() -> Scanner{
       return Scanner{ line: vec![], idx : 0}
   }
   #[allow(dead_code)]
   fn next<T: std::str::FromStr> (&mut self) -> T{
       if self.idx == self.line.len() {
           let mut buffer = String::new();
           std::io::stdin().read_line(&mut buffer).ok();

           let a : Vec<&str>  = buffer.trim().split(' ').collect();
           self.line = a.iter().map(|&s| String::from(s)).collect();
           self.idx = 0;
       }
       let ret : T = self.line[self.idx].parse::<T>().ok().expect("Parse error.");
       self.idx += 1;
       ret
   }
   #[allow(dead_code)]
   fn read_vec<T: std::str::FromStr>  (&mut self, n: usize) -> Vec<T>{
       let mut v : Vec<T>= Vec::with_capacity(n);
       for _i in 0..n {
           v.push(self.next());
       }
       v
   }
}


fn main() {
    let mut scan = Scanner::new();
    let s:String  = scan.next();
    let v = s.chars().collect::<Vec<char>>();

    if v[2] == v[3] && v[4] == v[5] {
        println!("Yes");
    }else{
        println!("No");
    }
}