#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <array>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

const i64 INF = 1001001001001001001;

using modint = atcoder::static_modint<998244353>;

int main(){
    string A[3]; rep(t,3) cin >> A[t];
    int n = A[0].size();

    bool ans = true;
    rep(y,2) rep(x,n) if(A[y][x] == A[y+1][x]) ans = false;
    rep(y,3) rep(x,n-1) if(A[y][x] == A[y][x+1]) ans = false;
    cout << (ans ? "Yes" : "No") << '\n';
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;