#![allow(unused_imports, unused_macros, dead_code)]
use std::{cmp::*, collections::*};

fn main() {
    let mut sc = Scanner::new();
    let s: Vec<Vec<char>> = (0..3).map(|_| sc.chars()).collect();
    let neigh = neighbor::Grid4(3, 3);
    let mut ans = "Yes";
    for i in 0..3 {
        for j in 0..3 {
            for (u, v) in neigh.iter(i, j) {
                if s[i][j] == s[u][v] {
                    ans = "No";
                }
            }
        }
    }
    put!(ans);
}

// @misc/neighbor
/// Misc - Neighbor
pub mod neighbor {
    pub struct Grid4(pub usize, pub usize);
    impl Grid4 {
        pub fn iter(&self, i: usize, j: usize) -> VecIter<(usize, usize)> {
            let mut v = vec![];
            for s in 0..3 {
                for t in 0..3 {
                    if (s + t) % 2 == 1
                        && (1..self.0 + 1).contains(&(i + s))
                        && (1..self.1 + 1).contains(&(j + t))
                    {
                        v.push((i + s - 1, j + t - 1));
                    }
                }
            }
            VecIter(v)
        }
    }
    pub struct Grid8(pub usize, pub usize);
    impl Grid8 {
        pub fn iter<'a>(&'a self, i: usize, j: usize) -> VecIter<(usize, usize)> {
            let mut v = vec![];
            for s in 0..3 {
                for t in 0..3 {
                    if (s * t) != 1
                        && (1..self.0 + 1).contains(&(i + s))
                        && (1..self.1 + 1).contains(&(j + t))
                    {
                        v.push((i + s - 1, j + t - 1));
                    }
                }
            }
            VecIter(v)
        }
    }
    pub struct VecIter<T>(Vec<T>);
    impl<T: Copy> Iterator for VecIter<T> {
        type Item = T;
        fn next(&mut self) -> Option<Self::Item> {
            self.0.pop()
        }
    }
}

// {{{
use std::io::{self, Write};
use std::str::FromStr;

pub struct Scanner {
    stdin: io::Stdin,
    buffer: VecDeque<String>,
}
impl Scanner {
    pub fn new() -> Self {
        Self {
            stdin: io::stdin(),
            buffer: VecDeque::new(),
        }
    }
    pub fn cin<T: FromStr>(&mut self) -> T {
        while self.buffer.is_empty() {
            let mut line = String::new();
            let _ = self.stdin.read_line(&mut line);
            for w in line.split_whitespace() {
                self.buffer.push_back(String::from(w));
            }
        }
        self.buffer.pop_front().unwrap().parse::<T>().ok().unwrap()
    }
    pub fn usize1(&mut self) -> usize {
        self.cin::<usize>() - 1
    }
    pub fn chars(&mut self) -> Vec<char> {
        self.cin::<String>().chars().collect()
    }
    pub fn vec<T: FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.cin()).collect()
    }
}
fn flush() {
    std::io::stdout().flush().unwrap();
}
#[macro_export]
macro_rules! min {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        it.next().map(|z| it.fold(z, |x, y| min!(x, y)))
    }};
    ($x:expr) => ($x);
    ($x:expr, $($ys:expr),*) => {{
        let t = min!($($ys),*);
        if $x < t { $x } else { t }
    }}
}
#[macro_export]
macro_rules! max {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        it.next().map(|z| it.fold(z, |x, y| max!(x, y)))
    }};
    ($x:expr) => ($x);
    ($x:expr, $($ys:expr),*) => {{
        let t = max!($($ys),*);
        if $x > t { $x } else { t }
    }}
}
#[macro_export]
macro_rules! trace {
    ($x:expr) => {
        #[cfg(debug_assertions)]
        eprintln!(">>> {} = {:?}", stringify!($x), $x)
    };
    ($($xs:expr),*) => { trace!(($($xs),*)) }
}
#[macro_export]
macro_rules! put {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        if let Some(x) = it.next() { print!("{}", x); }
        for x in it { print!(" {}", x); }
        println!("");
    }};
    ($x:expr) => { println!("{}", $x) };
    ($x:expr, $($xs:expr),*) => { print!("{} ", $x); put!($($xs),*) }
}
#[macro_export]
macro_rules! ndarray {
    ($x:expr;) => {
        $x
    };
    ($x:expr; $size:expr $( , $rest:expr )*) => {
        vec![ndarray!($x; $($rest),*); $size]
    };
}

// }}}