#include <cstdio>
#include <random>
#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <cassert>
#include <iomanip>
#include <iostream>
#include <algorithm>
#include <unordered_set>
#include <unordered_map>
#include <functional>
#include <chrono>


#define ll long long
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
using namespace std;

// вправо, вниз, влево, вверх
int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};

// ход конем
//int dx[] = {-2, -1, 1, 2, 2, 1, -1, -2};
//int dy[] = {1, 2, 2, 1, -1, -2, -2, -1};

mt19937 rnd(chrono::system_clock::now().time_since_epoch().count());
mt19937_64 rnd64(chrono::system_clock::now().time_since_epoch().count());
int rndInteger (int l, int r) {
    return uniform_int_distribution<int> (l, r)(rnd);
}

const int MOD = (int) 998244353;
const int N = (int) 1e6 + 7;

int grank(char c) {
    if (c == 'A') return 0;
    if (c == 'X') return 1;
    if ('2' <= c && c <= '9') return c-'0';
    if (c == 'J') return 10;
    if (c == 'Q') return 11;
    if (c == 'K') return 12;
}

int gsuit(char c) {
    if (c == 'C') return 0;
    if (c == 'H') return 1;
    if (c == 'D') return 2;
    if (c == 'S') return 3;
}

int n;

bool has(int msk, int i) {
    return (msk >> i) & 1;
}

inline void solve(){
    vector<int> cnt(4), g(4);
    vector<int> r;
    for (int i = 1; i <= n; i++) {
        char a, b;
        cin >> a >> b;
        a = grank(a);
        b = gsuit(b);

        if (!cnt[b]) r.pb(b);

        cnt[b]++;
        g[b] ^= 1 << a;
    }
    if (sz(r) == 1) {
        cout << "YES" << '\n';
        return;
    }

    vector<int> ind;
    for (int i = 0; i < sz(r); i++) ind.pb(i);

    do {
        int last = g[r[ind[0]]] & g[r[ind[1]]];
        if (last) {
            bool ok = true;
            for (int i = 2; i < sz(ind); i++) {
                int x = r[ind[i]];
                int y = r[ind[i - 1]];
                int q = g[y];
                if (cnt[y] > 1 && __builtin_popcount(last) == 1) {
                    q ^= last;
                }
                last = q & g[x];
                if (!last) {
                    ok = false;
                    break;
                }
            }
            if (ok) {
                cout << "YES" << '\n';
                return;
            }
        }

        if(sz(r) == 4) {
            for (int ac = 0; ac < 13; ++ac) if(has(g[ind[2]], ac)){
                for (int bc = 0; bc < 13; ++bc) if(ac != bc && has(g[ind[2]], bc)) {
                    if(has(g[ind[0]], ac) && has(g[ind[1]], bc)) {
                        int leftC = g[ind[2]] ^ (1 << ac) ^ (1 << bc);
                        int leftB = g[ind[1]] ^ (1 << bc);
                        int leftD = g[ind[3]];
                        last = (leftC & leftB);

                        if (!last) continue;

                        if (__builtin_popcount(last) == 1) {
                            leftC ^= last;
                        }

                        if((leftC & leftD) > 0) {
                            cout << "YES\n";
                            return;
                        }

                    }
                }
            }
        }
    }while (next_permutation(all(ind)));

//    // there is 4 suits, case
//    if(sz(r) == 4) {
//        //AAA CC BB CCC DDD
//
//        //fix C
//        for (int C = 0; C < 4; ++C) {
//            if(__builtin_popcount(g[C]) >= 4) {
//                ind.clear();
//                for (int oth = 0; oth < 4; ++oth) {
//                    if(C != oth) ind.push_back(oth);
//                }
//
//                do {
//
//
//                }while (next_permutation(all(ind)));
//            }
//        }
//    }

    cout << "NO" << '\n';
}

int main() {
#ifdef LOCAL
    freopen("in.txt", "r", stdin);
#endif

    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    while(cin >> n) solve();


    return 0;
}