#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, n) for (int i = (int)(n) - 1; i >= 0; i--)
#define repk(i, k, n) for (int i = k; i < (int)(n); i++)
#define all(v) v.begin(), v.end()
#define mod1 1000000007
#define mod2 998244353
#define vi vector<int>
#define vs vector<string>
#define vc vector<char>
#define vl vector<ll>
#define vvi vector<vector<int>>
#define vvc vector<vector<char>>
#define vvl vector<vector<ll>>
#define vvvi vector<vector<vector<int>>>
#define vvvl vector<vector<vector<ll>>>
#define pii pair<int,int>
#define pil pair<int,ll>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define vpii vector<pair<int,int>>
#define vpll vector<pair<ll,ll>>
#define vvpii vector<vector<pair<int,int>>>
#define vvpll vector<vector<pair<ll,ll>>>

template<typename T> void debug(T e){
    cerr << e << endl;
}

template<typename T> void debug(vector<T> &v){
    rep(i, v.size()){
        cerr << v[i] << " ";
    }
    cerr << endl;
}

template<typename T> void debug(vector<vector<T>> &v){
    rep(i, v.size()){
        rep(j, v[i].size()){
            cerr << v[i][j] << " ";
        }
        cerr << endl;
    }
}

template<typename T> void debug(vector<pair<T, T>> &v){
    rep(i,v.size()){
        cerr << v[i].first << " " << v[i].second << endl;
    }
}

template<typename T> void debug(set<T> &st){
    for (auto itr = st.begin(); itr != st.end(); itr++){
        cerr << *itr << " ";
    }
    cerr << endl;
}

template<typename T> void debug(multiset<T> &ms){
    for (auto itr = ms.begin(); itr != ms.end(); itr++){
        cerr << *itr << " ";
    }
    cerr << endl;
}

template<typename T> void debug(map<T, T> &mp){
    for (auto itr = mp.begin(); itr != mp.end(); itr++){
        cerr << itr->first << " " << itr->second << endl;
    }
}

void debug_out(){
    cerr << endl;
}

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T){
    cerr << H << " ";
    debug_out(T...);
}

bool nand(bool a, bool b){
    bool ret;
    if (a & b){
        ret = false;
    }
    else{
        ret = true;
    }
    return ret;
}


int main(){
    vector<string> a(6);
    rep(i,6) cin >> a[i];
    map<string, int> mp;
    rep(i,6){
        mp[a[i]]++;
    }
    int now = 1;
    for (auto itr = mp.begin(); itr != mp.end(); itr++){
        itr->second = now;
        now++;
    }
    vector<int> vec(6);
    rep(i,6){
        vec[i] = mp[a[i]];
    }

    bool pos = false;
    for (int i = 0; i < (1 << 7); i++){
        vector<bool> chart(6);
        for (int j = 0; j < 6; j++){
            if ((i >> vec[j]) & 1){
                chart[j] = true;
            }
            else{
                chart[j] = false;
            }
        }
        if (nand(nand(nand(chart[0], chart[1]), chart[2]), nand(nand(chart[3], chart[4]), chart[5]))){
            pos = true;
        }
    }
    if (pos) cout << "YES" << endl;
    else cout << "NO" << endl;
}