#include "bits/stdc++.h"
// Begin Header {{{
#define all(x) (x).begin(), (x).end()
#define rep(i, s, n) for (i64 i = (s), i##_limit = (n); i < i##_limit; ++i)
#define repr(i, s, t) for (i64 i = (s), i##_limit = (t); i >= i##_limit; --i)
#define repc(i, s, t) for (i64 i = (s), i##_limit = (t); i <= i##_limit; ++i)
#define var(type, ...) \
    type __VA_ARGS__;  \
    read(__VA_ARGS__);
#ifndef DBG
#define dump(...)
#endif
using namespace std;
using i64 = int_fast64_t;
using pii = pair<i64, i64>;
template <class T, class U>
inline bool chmax(T &a, const U &b) {
    return b > a && (a = b, true);
}
template <class T, class U>
inline bool chmin(T &a, const U &b) {
    return b < a && (a = b, true);
}
constexpr int INF = 0x3f3f3f3f;
constexpr i64 LINF = 0x3f3f3f3f3f3f3f3fLL;

template <class T>
inline vector<T> makeV(const T &initValue, size_t sz) {
    return vector<T>(sz, initValue);
}

template <class T, class... Args>
inline auto makeV(const T &initValue, size_t sz, Args... args) {
    return vector<decltype(makeV<T>(initValue, args...))>(
        sz, makeV<T>(initValue, args...));
}

template <class T>
inline istream &operator>>(istream &is, vector<T> &vec) {
    for (auto &e : vec) is >> e;
    return is;
}

inline void read() {}

template <class Head, class... Tail>
inline void read(Head &head, Tail &... tail) {
    cin >> head;
    read(tail...);
}

inline void print() { cout << "\n"; }

template <class Head, class... Tail>
inline void print(Head &&head, Tail &&... tail) {
    cout << head;
    if (sizeof...(tail)) cout << ' ';
    print(forward<Tail>(tail)...);
}

template <class T>
inline ostream &operator<<(ostream &os, const vector<T> &vec) {
    static constexpr const char *delim[] = {" ", ""};
    for (const auto &e : vec) os << e << delim[&e == &vec.back()];
    return os;
}

template <class Container>
struct Rev {
    Container &x_;
    inline Rev(Container &x) : x_(x) {}
    inline auto begin() { return rbegin(x_); }
    inline auto end() { return rend(x_); }
};
// }}} End Header

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.setf(ios_base::fixed);
    cout.precision(12);

    var(i64, N);

    vector<i64> X(3);
    read(X);

    vector<string> ss(N);
    rep(i, 0, N) { read(ss[i]); }

    vector<char> ans(N);

    rep(q, 0, N) {
        int i = ss[q][0] - 'A';
        int j = ss[q][1] - 'A';

        if (X[i] == X[j]) {
            if (q + 1 < N) {
                const int ni = ss[q + 1][0] - 'A';
                const int nj = ss[q + 1][1] - 'A';
                if (i == ni || i == nj) {
                    ++X[i];
                    --X[j];
                    ans[q] = i;
                } else {
                    ++X[j];
                    --X[i];
                    ans[q] = j;
                }
            } else {
                --X[i];
                ++X[j];
                ans[q] = j;
            }
        } else {
            if (X[i] > X[j]) swap(i, j);
            ++X[i];
            --X[j];
            ans[q] = i;
        }

        if (X[i] < 0 || X[j] < 0) {
            print("No");
            return 0;
        }
    }

    print("Yes");
    rep(i, 0, N) { print(char(ans[i] + 'A')); }

    return 0;
}


Measured memory_bytes: 6672