#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include <iomanip>
using namespace std;

int main(){
    int n = 9;
    string s1, s2, s3;
    cin >> s1 >> s2 >> s3;
    s1 = s1 + s2 + s3;
    while(n){
        if (s1[9-n] == s1[10-n]){
            cout << "No" << endl;
            exit(0);
        }
        n--;
    }
    cout << "Yes" << endl;
}