// 奇特的立方体.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include <iostream>

#include <cstring>

using namespace std;

const int MAX = ;

int n = , flag, arr[MAX]/*8个数字*/, vis[MAX]/*8个位置是否放了*/,map[MAX]/*每个位置上方的数字*/;

void printa()

{

    for (int i = ; i < n; i++) cout << map[i] << " ";

    cout << endl;

}

int check()

{

    //printa();

    int s[] = {  };

    s[] = map[] + map[] + map[] + map[];

    s[] = map[] + map[] + map[] + map[];

    s[] = map[] + map[] + map[] + map[];

    s[] = map[] + map[] + map[] + map[];

    s[] = map[] + map[] + map[] + map[];

    s[] = map[] + map[] + map[] + map[];

    for (int i = ; i < ; i++)

    {

        if (s[i - ] != s[i]) return ;

    }

    //cout << "sum:" << s[0] << endl;

    return ;

}

void DFS(int pos)

{

    //cout << "pos:" << pos << endl;

    if (flag) return;

    if (pos >= n)

    {

        if (check()) { flag = ;}

        return;

    }

    for (int i = ; i < n; i++)

    {

        if (!vis[i])

        {

            vis[i] = ;

            map[i] = arr[pos];

            DFS(pos+);

            vis[i] = ;

            map[i] = ;

        }

    }

}

int main()

{

    for (int i = ; i < n; i++) cin >> arr[i];

    flag = ;

    memset(vis, , sizeof(vis));

    memset(map, , sizeof(map));

    DFS();

    if (flag) cout << "YES" << endl;

    else cout << "NO" << endl;

    return ;

}