Language: C++

#include        "algorithm"
#include        "iostream"
#include        "numeric"
#include        "iomanip"
#include        "cstring"
#include        "math.h"
#include        "bitset"
#include        "string"
#include        "vector"
#include        "ctime"
#include        "queue"
#include        "stack"
#include        "map"
#include        "set"

#include        "ext/pb_ds/assoc_container.hpp" // Common file
#include        "ext/pb_ds/tree_policy.hpp" // Including tree_order_statistics_node_update
#include        "ext/pb_ds/detail/standard_policies.hpp"

using namespace std;
using namespace gnu_pbds;


#define          f first
#define          lgn 25
#define          endl '\n'
#define          sc second
#define          pb push_back
#define          N (int)2e5+5
#define          PI acos(-1.0)
#define          int long long 
#define          vi vector<int>
#define          mod 1000000007
#define          ld long double
#define          eb emplace_back
#define          mii map<int,int>
#define          vpii vector<pii>
#define          pii pair<int,int>
#define          pq priority_queue
#define          BLOCK (int)sqrt(N)
#define          test(x) while(x--)
#define          all(x) begin(x),end(x)
#define          allr(x) x.rbegin(),x.rend()
#define          fo(i,a,n) for(int i=a;i<n;i++)
#define          rfo(i,n,a) for(int i=n;i>=a;i--)
#define          FAST ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define          time() cerr << "Time : " << (double)clock() / (double)CLOCKS_PER_SEC << "s\n"
#define      bug(...)       __f (#__VA_ARGS, VA_ARGS)

typedef tree< int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update > 
OS ;

template <typename Arg1>
void __f (const char* name, Arg1&& arg1) { cout << name << " : " << arg1 << endl; }
template <typename Arg1, typename... Args>
void __f (const char* names, Arg1&& arg1, Args&&... args)
{
     const char* comma = strchr (names + 1, ',');
     cout.write (names, comma - names) << " : " << arg1 << " | "; __f (comma + 1, args...);
}

const int inf = 0x3f3f3f3f;
const int INF = 0x3f3f3f3f3f3f3f3f;

enum x
{
  a , b , c
};

int n , A , B , C;
string s[N];
mii mp;
string ans;
int dp[N][4];

int makeAns(int i = 1 , int na = A , int nb = B , int nc = C , int now = 0)
{
  if( na < 0 or nb < 0 or nc < 0 ) return 0;
  if( i == n + 1) return ( na >= 0 and nb >= 0 and nc >= 0 );

  int& res = dp[i][now];
  if( ~res ) res;

  res = 0;

  if( s[i] == "AB" )
  {
    if( na - 1 >= 0 )
    {
      bool ok = makeAns( i+1 , na - 1 , nb + 1 , nc , b);
      if( ok )
      {
        ans[i] = 'B';
        return res = 1;
      }
    }
    if( nb - 1 >= 0 )
    {
      bool ok = makeAns( i+1 , na + 1 , nb - 1 , nc , a);
      if( ok )
      {
        ans[i] = 'A';
        return res = 1;
      }      
    }
  }

  if( s[i] == "AC" )
  {
    if( na - 1 >= 0 )
    {
      bool ok = makeAns( i+1 , na - 1 , nb , nc + 1 , c);
      if( ok )
      {
        ans[i] = 'C';
        return res = 1;
      }
    }
    if( nc - 1 >= 0 )
    {
      bool ok = makeAns( i+1 , na + 1, nb , nc - 1 , a);
      if( ok )
      {
        ans[i] = 'A';
        return res = 1;
      }      
    }
  }

  if( s[i] == "BC" )
  {
    if( nb - 1 >= 0 )
    {
      bool ok = makeAns( i+1 , na , nb - 1  , nc + 1 , c );
      if( ok )
      {
        ans[i] = 'C';
        return res = 1;
      }      
    }
    if( nc - 1 >= 0 )
    {
      bool ok = makeAns( i+1 , na  , nb + 1 , nc - 1 , b);
      if( ok )
      {
        ans[i] = 'B';
        return res = 1;
      }      
    }
  }

  return res;
}

void go()
{
  cin >> n >> A >> B >> C;

  ans.assign(n + 1 , '.' );
  fo(i,1,n+1)
  {
    cin >> s[i];

    if( s[i] == "AB" ) mp[a]++ , mp[b]++;
    if( s[i] == "AC" ) mp[a]++ , mp[c]++;
    if( s[i] == "BC" ) mp[b]++ , mp[c]++;
  }

  memset( dp , -1 , sizeof dp );
  bool can = makeAns();

  if( can ) 
  {
    cout << "Yes\n";

    fo(i,1,n+1) if( ans[i] != '.' ) cout << ans[i] << endl;
  }
  else cout << "No\n";
}

int32_t main()
{
  FAST;     
  int t=1; 
  // cin>>t;
  test(t) go();
}#include        "algorithm"
#include        "iostream"
#include        "numeric"
#include        "iomanip"
#include        "cstring"
#include        "math.h"
#include        "bitset"
#include        "string"
#include        "vector"
#include        "ctime"
#include        "queue"
#include        "stack"
#include        "map"
#include        "set"

#include        "ext/pb_ds/assoc_container.hpp" // Common file
#include        "ext/pb_ds/tree_policy.hpp" // Including tree_order_statistics_node_update
#include        "ext/pb_ds/detail/standard_policies.hpp"

using namespace std;
using namespace gnu_pbds;


#define          f first
#define          lgn 25
#define          endl '\n'
#define          sc second
#define          pb push_back
#define          N (int)2e5+5
#define          PI acos(-1.0)
#define          int long long 
#define          vi vector<int>
#define          mod 1000000007
#define          ld long double
#define          eb emplace_back
#define          mii map<int,int>
#define          vpii vector<pii>
#define          pii pair<int,int>
#define          pq priority_queue
#define          BLOCK (int)sqrt(N)
#define          test(x) while(x--)
#define          all(x) begin(x),end(x)
#define          allr(x) x.rbegin(),x.rend()
#define          fo(i,a,n) for(int i=a;i<n;i++)
#define          rfo(i,n,a) for(int i=n;i>=a;i--)
#define          FAST ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define          time() cerr << "Time : " << (double)clock() / (double)CLOCKS_PER_SEC << "s\n"
#define      bug(...)       __f (#__VA_ARGS, VA_ARGS)

typedef tree< int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update > 
OS ;

template <typename Arg1>
void __f (const char* name, Arg1&& arg1) { cout << name << " : " << arg1 << endl; }
template <typename Arg1, typename... Args>
void __f (const char* names, Arg1&& arg1, Args&&... args)
{
     const char* comma = strchr (names + 1, ',');
     cout.write (names, comma - names) << " : " << arg1 << " | "; __f (comma + 1, args...);
}

const int inf = 0x3f3f3f3f;
const int INF = 0x3f3f3f3f3f3f3f3f;

enum x
{
  a , b , c
};

int n , A , B , C;
string s[N];
mii mp;
string ans;
int dp[N][4];

int alpha(int i = 1 , int na = A , int nb = B , int nc = C , int now = 0)
{
  if( na < 0 or nb < 0 or nc < 0 ) return 0;
  if( i == n + 1) return ( na >= 0 and nb >= 0 and nc >= 0 );

  int& res = dp[i][now];
  if( ~res ) res;

  res = 0;

  if( s[i] == "AB" )
  {
    if( na - 1 >= 0 )
    {
      bool ok = alpha( i+1 , na - 1 , nb + 1 , nc , b);
      if( ok )
      {
        ans[i] = 'B';
        return res = 1;
      }
    }
    if( nb - 1 >= 0 )
    {
      bool ok = alpha( i+1 , na + 1 , nb - 1 , nc , a);
      if( ok )
      {
        ans[i] = 'A';
        return res = 1;
      }      
    }
  }

  if( s[i] == "AC" )
  {
    if( na - 1 >= 0 )
    {
      bool ok = alpha( i+1 , na - 1 , nb , nc + 1 , c);
      if( ok )
      {
        ans[i] = 'C';
        return res = 1;
      }
    }
    if( nc - 1 >= 0 )
    {
      bool ok = alpha( i+1 , na + 1, nb , nc - 1 , a);
      if( ok )
      {
        ans[i] = 'A';
        return res = 1;
      }      
    }
  }

  if( s[i] == "BC" )
  {
    if( nb - 1 >= 0 )
    {
      bool ok = alpha( i+1 , na , nb - 1  , nc + 1 , c );
      if( ok )
      {
        ans[i] = 'C';
        return res = 1;
      }      
    }
    if( nc - 1 >= 0 )
    {
      bool ok = alpha( i+1 , na  , nb + 1 , nc - 1 , b);
      if( ok )
      {
        ans[i] = 'B';
        return res = 1;
      }      
    }
  }

  return res;
}

void go()
{
  cin >> n >> A >> B >> C;

  ans.assign(n + 1 , '.' );
  fo(i,1,n+1)
  {
    cin >> s[i];

    if( s[i] == "AB" ) mp[a]++ , mp[b]++;
    if( s[i] == "AC" ) mp[a]++ , mp[c]++;
    if( s[i] == "BC" ) mp[b]++ , mp[c]++;
  }

  memset( dp , -1 , sizeof dp );
  bool ans = alpha();

  if( ans ) 
  {
    cout << "Yes\n";

    fo(i,1,n+1) if( ans[i] != '.' ) cout << ans[i] << endl;
  }
  else cout << "No\n";
}

int32_t main()
{
  FAST;     
  int t=1; 
  // cin>>t;
  test(t) go();
}

Compiler output:
a.cc:48:21: error: '#' is not followed by a macro parameter
   48 | #define      bug(...)       __f (#__VA_ARGS, VA_ARGS)
      |                     ^
a.cc:187:2: error: stray '#' in program
  187 | }#include        "algorithm"
      |  ^
a.cc:234:21: error: '#' is not followed by a macro parameter
  234 | #define      bug(...)       __f (#__VA_ARGS, VA_ARGS)
      |                     ^
a.cc:21:17: error: 'gnu_pbds' is not a namespace-name
   21 | using namespace gnu_pbds;
      |                 ^~~~~~~~
a.cc:50:9: error: 'tree' does not name a type
   50 | typedef tree< int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update >
      |         ^~~~
a.cc:187:3: error: 'include' does not name a type
  187 | }#include        "algorithm"
      |   ^~~~~~~
a.cc:207:17: error: 'gnu_pbds' is not a namespace-name
  207 | using namespace gnu_pbds;
      |                 ^~~~~~~~
a.cc:236:9: error: 'tree' does not name a type
  236 | typedef tree< int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update >
      |         ^~~~
a.cc:240:6: error: redefinition of 'template<class Arg1> void __f(const char*, Arg1&&)'
  240 | void __f (const char* name, Arg1&& arg1) { cout << name << " : " << arg1 << endl; }
      |      ^~~
a.cc:54:6: note: 'template<class Arg1> void __f(const char*, Arg1&&)' previously declared here
   54 | void __f (const char* name, Arg1&& arg1) { cout << name << " : " << arg1 << endl; }
      |      ^~~
a.cc:242:6: error: redefinition of 'template<class Arg1, class ... Args> void __f(const char*, Arg1&&, Args&& ...)'
  242 | void __f (const char* names, Arg1&& arg1, Args&&... args)
      |      ^~~
a.cc:56:6: note: 'template<class Arg1, class ... Args> void __f(const char*, Arg1&&, Args&& ...)' previously declared here
   56 | void __f (const char* names, Arg1&& arg1, Args&&... args)
      |      ^~~
a.cc:248:11: error: redefinition of 'const long long int inf'
  248 | const int inf = 0x3f3f3f3f;
      |           ^~~
a.cc:62:11: note: 'const long long int inf' previously defined here
   62 | const int inf = 0x3f3f3f3f;
      |           ^~~
a.cc:249:11: error: redefinition of 'const long long int INF'
  249 | const int INF = 0x3f3f3f3f3f3f3f3f;
      |           ^~~
a.cc:63:11: note: 'const long long int INF' previously defined here
   63 | const int INF = 0x3f3f3f3f3f3f3f3f;
      |           ^~~
a.cc:251:6: error: multiple definition of 'enum x'
  251 | enum x
      |      ^
a.cc:65:6: note: previous definition here
   65 | enum x
      |      ^
a.cc:256:5: error: redefinition of 'long long int n'
  256 | int n , A , B , C;
      |     ^
a.cc:70:5: note: 'long long int n' previously declared here
   70 | int n , A , B , C;
      |     ^
a.cc:256:9: error: redefinition of 'long long int A'
  256 | int n , A , B , C;
      |         ^
a.cc:70:9: note: 'long long int A' previously declared here
   70 | int n , A , B , C;
      |         ^
a.cc:256:13: error: redefinition of 'long long int B'
  256 | int n , A , B , C;
      |             ^
a.cc:70:13: note: 'long long int B' previously declared here
   70 | int n , A , B , C;
      |             ^
a.cc:256:17: error: redefinition of 'long long int C'
  256 | int n , A , B , C;
      |                 ^
a.cc:70:17: note: 'long long int C' previously declared here
   70 | int n , A , B , C;
      |                 ^
a.cc:257:8: error: redefinition of 'std::string s [200005]'
  257 | string s[N];
      |        ^
a.cc:71:8: note: 'std::string s [200005]' previously declared here
   71 | string s[N];
      |        ^
a.cc:258:5: error: redefinition of 'std::map<long long int, long long int> mp'
  258 | mii mp;
      |     ^~
a.cc:72:5: note: 'std::map<long long int, long long int> mp' previously declared here
   72 | mii mp;
      |     ^~
a.cc:259:8: error: redefinition of 'std::string ans'
  259 | string ans;
      |        ^~~
a.cc:73:8: note: 'std::string ans' previously declared here
   73 | string ans;
      |        ^~~
a.cc:260:5: error: redefinition of 'long long int dp [200005][4]'
  260 | int dp[N][4];
      |     ^~
a.cc:74:5: note: 'long long int dp [200005][4]' previously declared here
   74 | int dp[N][4];
      |     ^~
a.cc:341:6: error: redefinition of 'void go()'
  341 | void go()
      |      ^~
a.cc:155:6: note: 'void go()' previously defined here
  155 | void go()
      |      ^~
a.cc: In function 'void go()':
a.cc:362:24: error: invalid types 'bool[long long int]' for array subscript
  362 |     fo(i,1,n+1) if( ans[i] != '.' ) cout << ans[i] << endl;
      |                        ^
a.cc:362:48: error: invalid types 'bool[long long int]' for array subscript
  362 |     fo(i,1,n+1) if( ans[i] != '.' ) cout << ans[i] << endl;
      |                                                ^
a.cc: At global scope:
a.cc:367:9: error: redefinition of 'int32_t main()'
  367 | int32_t main()
      |         ^~~~
a.cc:181:9: note: 'int32_t main()' previously defined here
  181 | int32_t main()
      |         ^~~~