Language: C++

#include<bits/stdc++.h>
#define int long long
#define rep(i,a,b) for(int i=a;i<b;i+=1)
#define reps(i,a,b) for(int i=a;i>=b;i-=1)
#define vi vector<int>
#define pb push_back
#define pi pair<int, int>
#define mp make_pair
#define ff first
#define ss second
#define in(x) int x; cin>>x;
#define inn(x, y) int x, y; cin>>x>>y;
#define mi unordered_map<int,int>
#define mem(x) memset(x, 0, sizeof(x))
#define IOS ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
using namespace std;

//bool primes[1000001];vi prime;
//void seive(){memset(primes, true, sizeof(primes));primes[0] = primes[1] = false;for(int i = 2; i*i<=1000000;i += 1){
//if(primes[i]){for(int j = i*i; j <= 1000000;j += i) primes[j] = false;}}rep(i, 2, 1000001){if(primes[i]) prime.pb(i);}}

//int gcd(int a, int b){return b==0 ? a : gcd(b, a%b);}

int32_t main(void){
	IOS;
	
	inn(n, a);
	inn(b, c);
	string s[n];
	vector<char> ans;
	rep(i, 0, n) cin>>s[i];
	rep(i, 0, n)
	{
		if(s[i] == "AB")
		{
			if(a < b) 
			{
				a+=1;
				b-=1;
				ans.pb('A');
			}
			else if(b < a)
			{
				b+=1;
				a-=1;
				ans.pb('B');
			}
			else
			{
				if(s[i+1] == 'AC')
				{
					v.pb('A');
					a += 1;
					b -= 1;
				}
				else
				{
					v.pb('B');
					b+=1;
					a-=1;
				}
			}
		}
		else if(s[i] == "AC")
		{
			if(a < c) 
			{
				a+=1;
				c-=1;
				ans.pb('A');
			}
			else if(c < a)
			{
				c += 1;
				a -= 1;
				ans.pb('C');
			}
			else
			{
				if(s[i+1] == 'AB')
				{
					v.pb('A');
					a += 1;
					c -= 1;
				}
				else
				{
					v.pb('C');
					c += 1;
					a -= 1;
				}
			}
		}
		else
		{
			if(c < b) 
			{
				c+=1;
				b-=1;
				ans.pb('C');
			}
			else if(c > b)
			{
				b+=1;
				c-=1;
				ans.pb('B');
			}
			else
			{
				if(s[i+1] == 'AB')
				{
					v.pb('B');
					b += 1;
					c -= 1;
				}
				else
				{
					v.pb('C');
					c += 1;
					b -= 1;
				}
			}
		}
	}
	if(a<0 || b<0 || c<0) cout<<"No";
	else
	{
		cout<<"Yes"<<'\n';
		rep(i, 0, n) cout<<ans[i]<<'\n';
	}
}

Compiler output:
a.cc:50:46: warning: multi-character character constant [-Wmultichar]
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
a.cc:80:46: warning: multi-character character constant [-Wmultichar]
   80 |                                 if(s[i+1] == 'AB')
      |                                              ^~~~
a.cc:110:46: warning: multi-character character constant [-Wmultichar]
  110 |                                 if(s[i+1] == 'AB')
      |                                              ^~~~
a.cc: In function 'int32_t main()':
a.cc:50:43: error: no match for 'operator==' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'int')
   50 |                                 if(s[i+1] == 'AC')
      |                                    ~~~~~~ ^~ ~~~~
      |                                         |    |
      |                                         |    int
      |                                         std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:1:
/usr/include/c++/14/bits/regex.h:1103:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1103 |     operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1103:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/regex.h:1199:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1199 |     operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1199:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/regex.h:1274:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1274 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1274:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/regex.h:1366:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1366 |     operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1366:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/regex.h:1441:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1441 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1441:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/regex.h:1534:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1534 |     operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1534:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/regex.h:1613:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1613 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1613:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/regex.h:2186:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator==(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2186 |     operator==(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2186:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::pair<_T1, _T2>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:50:46: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   50 |                                 if(s[i+1] == 'AC')
      |                                              ^~~~
In file included from /usr/include/c++/14/bits/char_traits.h:42,
                 from /usr/include/c++/14/string:42,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/1