#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int) a.size()
#define all(a) a.begin(),a.end()
#define vec(...) vector<__VA_ARGS__>
#define _3Wcdivh ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

int getnum(char ch){
	if(ch>='2' and ch<='9'){
		return ch-'0';
	}
	if(ch=='A'){
		return 0;
	}
	return 10;
}

int getrank(char ch){
	if(ch=='C'){
		return 0;
	}
	if(ch=='D'){
		return 1;
	}
	if(ch=='H'){
		return 2;
	}
	return 3;
}

int n;

void slv(){
	vec(vi) a(4);
	vec(vi) cnt(4,vi(11));
	rep(i,n){
		string s;
		cin>>s;
		int x=getnum(s[0]);
		int y=getrank(s[1]);
		a[y].pb(x);
		cnt[y][x]+=1;
	}
	vi ert;
	rep(i,4){
		if(sz(a[i])){
			ert.pb(i);
		}
	}
	if(sz(ert)==1){
		cout<<"YES\n";
		return;
	}
	bool pns=0;
	
	auto ask=[&](vec(pii) take){
		auto dfs=[&](auto self,int i,int lst=-1)->void{
			if(i==sz(take)){
				pns=1;
				return;
			}
			auto [x,c]=take[i];
			if(lst==-1){
				rep(j,11){
					if(cnt[x][j]>0){
						cnt[x][j]-=1;
						self(self,i+1,j);
						cnt[x][j]+=1;
					}
				}
			}else{
				if(cnt[x][lst]==0){
					return;
				}
				cnt[x][lst]-=1;
				if(c==1){
					self(self,i+1,lst);
				}else{
					rep(j,11){
						if(cnt[x][j]>0){
							cnt[x][j]-=1;
							self(self,i+1,j);
							cnt[x][j]+=1;
						}
					}
					self(self,i+1,lst);
				}
				cnt[x][lst]+=1;
			}
		};
		dfs(dfs,0,-1);
	};

	do{
		if(pns) break;
		vec(pii) take;
		if(sz(ert)==3){
			take.pb({ert[0],1});
			take.pb({ert[1],2});
			take.pb({ert[2],1});
			ask(take);
		}else if(sz(ert)==2){
			take.pb({ert[0],1});
			take.pb({ert[1],1});
			ask(take);
		}else{
			int pvt=ert[0];
			take={
				{pvt,1},
				{ert[1],2},
				{ert[2],2},
				{ert[3],1}
			};
			ask(take);
			take={
				{pvt,1},
				{ert[1],2},
				{pvt,1},
				{ert[2],2},
				{ert[3],1}
			};
			ask(take);
			take={
				{pvt,1},
				{ert[1],2},
				{ert[2],2},
				{pvt,1},
				{ert[3],1}
			};
			ask(take);
			take={
				{pvt,1},
				{ert[1],2},
				{pvt,1},
				{ert[2],2},
				{pvt,1},
				{ert[3],1}
			};
			ask(take);
			take={
				{ert[1],1},
				{pvt,2},
				{ert[2],2},
				{ert[3],1}
			};
			ask(take);
			take={
				{ert[1],1},
				{pvt,2},
				{ert[2],2},
				{pvt,2},
				{ert[3],1}
			};
			ask(take);
			take={
				{ert[1],1},
				{pvt,2},
				{ert[2],2},
				{pvt,1},
				{ert[3],1}
			};
			ask(take);
			take={
				{ert[1],1},
				{ert[2],2},
				{pvt,2},
				{ert[3],1}
			};
			ask(take);
			take={
				{ert[1],1},
				{pvt,1},
				{ert[2],2},
				{pvt,2},
				{ert[3],1}
			};
			ask(take);
		}
	}while(next_permutation(all(ert)));
	cout<<(pns?"YES":"NO")<<"\n";
}

signed main(){
_3Wcdivh;
	while(cin>>n){
		slv();
	}
}