Language: C++

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <climits>
#include <cstring>
#include <cassert>


using namespace std;
#define SZ(x) (int)(x.size())
#define REP(i, n) for(int i=0;i<n;++i)
#define FOR(i, a, b) for(int i=a;i<b;++i)
#define RREP(i, n) for(int i=n-1;i>=0;--i)
#define RFOR(i, a, b) for(int i=b-1;i>=a;--i)

#define all(x) begin(x),end(x)
#define dump(x) cerr<<#x<<" = "<<(x)<<endl
#define debug(x) cerr<<#x<<" = "<<(x)<<" (L"<<__LINE__<<")"<< endl;

using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using P = pair<int, int>;
const double eps = 1e-8;
const ll MOD = 1000000007;
const int INF = INT_MAX / 2;
const ll LINF = LLONG_MAX / 2;

template<class T>
bool chmax(T &a, const T &b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
bool chmin(T &a, const T &b) {
    if (b < a) {
        a = b;
        return true;
    }
    return false;
}


template<typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> p) {
    os << p.first << ":" << p.second;
    return os;
}

template<class T>
ostream &operator<<(ostream &os, const vector<T> &v) {
    os << "[";
    REP(i, SZ(v)) {
        if (i) os << ", ";
        os << v[i];
    }
    return os << "]";
}

// edit

bool cmm(string s, string t, char c){
    bool fs = false;
    bool ft = false;
    
    for(auto e : s){
        if(e == c) fs = true;
    }
    
    for(auto e : t){
        if(e == c) ft = true;
    }
    
    return fs && ft;
}


void solve(int N, vector<ll> var, vector<string> S) {
//    int N;
//    cin >> N;
//    ll A, B, C;
//    cin >> A >> B >> C;
//    vector<ll> var(3);
//    for(int i = 0; i < 3; ++i){
//        cin >> var[i];
//    }
    
//    vector<string> S(N);
//
//    for(int i = 0; i < N; ++i){
//        cin >> S[i];
//    }
    
    vector<char> ans;
    for(int i = 0; i < N; ++i){
        ll &X = var[S[i][0] - 'A'];
        ll &Y = var[S[i][1] - 'A'];
        
//        assert(X >= 0 && Y >= 0);
        
        if(X == 0 && Y == 0){
            cout << "No" << endl;
            return;
        }
        
        if(X == 0 || Y > 1){
            X++;
            Y--;
            ans.push_back(S[i][0]);
            continue;
        }
        
        if(Y == 0 || X > 1){
            X--;
            Y++;
            ans.push_back(S[i][1]);
            continue;
        }
        
//        assert(X == 1 && Y == 1);
        
        
        if(i == N - 1){
            X--;
            Y++;
            ans.push_back(S[i][1]);
            continue;
        }
        
        if(S[i] == S[i+1]){
            X--;
            Y++;
            ans.push_back(S[i][1]);
            continue;
        }
        
        if(cmm(S[i], S[i+1], 'A')){
            X++;
            Y--;
            ans.push_back(S[i][0]);
            continue;
        } else if(cmm(S[i], S[i+1], 'C')){
            X--;
            Y++;
            ans.push_back(S[i][1]);
            continue;
        }else{
            if(S[i] == "AB"){
                X--;
                Y++;
                ans.push_back(S[i][1]);
                continue;
            }else{
                 "BC"
                X++;
                Y--;
                ans.push_back(S[i][0]);
                continue;
            }
        }
    }
    
    cout << "Yes" << endl;
    for(auto e : ans){
        cout << e << endl;
    }
    
//    assert(false);

}


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
//    std::ifstream in("input.txt");
//    std::cin.rdbuf(in.rdbuf());
    
//    while(true){
//        int N = 1000;
//
//        vector<ll> var(3);
//        REP(i,3){
//            var[i] = rand() % 3;
//        }
//
//        vector<string> base = {"AB", "BC", "AC"};
//        vector<string> S(N);
//
//        for(int i = 0; i < N; ++i){
//            S[i] = base[rand() % 3];
//        }
//
//        solve(N, var, S);
//
//
//    }
//
    

    int N;
    cin >> N;
    vector<ll> var(3);
    for(int i = 0; i < 3; ++i){
        cin >> var[i];
    }

    vector<string> S(N);

    for(int i = 0; i < N; ++i){
        cin >> S[i];
    }
    
    solve(N, var, S);


    return 0;
}


Compiler output:
a.cc: In function 'void solve(int, std::vector<long long int>, std::vector<std::__cxx11::basic_string<char> >)':
a.cc:189:22: error: expected ';' before 'X'
  189 |                  "BC"
      |                      ^
      |                      ;
  190 |                 X++;
      |                 ~