Language: C++

#include <bits/stdc++.h>
using namespace std;
int C[3];
string s[100005];
int ans[100005];
void no(){
    printf("No\n");
    exit(0);
}
int i;
void AB(){ ans[i] = 1; C[0]--; C[1]++; }
void BA(){ ans[i] = 0; C[1]--; C[0]++; }
void AC(){ ans[i] = 2; C[0]--; C[2]++; }
void CA(){ ans[i] = 0; C[2]--; C[0]++; }
void BC(){ ans[i] = 2; C[1]--; C[2]++; }
void CB(){ ans[i] = 1; C[2]--; C[1]++; }
voi
long long x;
int main(){
    int n;
    scanf("%d%d%d%d",&n,&C[0],&C[1],&C[2]);
    x = (long long)C[0]+(long long)C[1]+(long long)C[2];
    for (i = 0; i < n; i++){
        cin >> s[i];
    }
    if (x == 0ll){
        printf("No\n");
        return 0;
    }
    if (x == 1ll){
        for (i = 0; i < n; i++){
            if (s[i] == "AB"){
                if (C[0] == 1) AB();
                else if (C[1] == 1) BA();
                else no();
            }
            if (s[i] == "AC"){
                if (C[0] == 1) AC();
                else if (C[2] == 1) CA();
                else no();
            }
            if (s[i] == "BC"){
                if (C[1] == 1) BC();
                else if (C[2] == 1) CB();
                else no();
            }
        }
        return 0;
    }
    if (s[0] == "AB" && C[0] == 0 && C[1] == 0) no();
    if (s[0] == "BC" && C[1] == 0 && C[2] == 0) no();
    if (s[0] == "AC" && C[0] == 0 && C[2] == 0) no();
    for (i = 0; i < n; i++){
        if (s[i] == "AB"){
            if (C[0] == 0) BA();
            else if (C[1] == 0) AB();
            else if (x == 2ll && C[0] == 1 && C[1] == 1){
                if (i == n-1 || s[i+1] == s[i]){
                    if (C[1] > C[0]) BA();
                    else AB();
                }
                else if (s[i+1] == "BC") AB();
                else BA();
            }
            else if (C[1] > C[0]) BA();
            else AB();
        }
        if (s[i] == "AC"){
            if (C[0] == 0) CA();
            else if (C[2] == 0) AC();
            else if (x == 2ll && C[0] == 1 && C[2] == 1){
                if (i == n-1 || s[i+1] == s[i]){
                    if (C[0] > C[2]) AC();
                    else CA();
                }
                else if (s[i+1] == "BC") AC();
                else CA();
            }
            else if (C[0] > C[2]) AC();
            else CA();
        }
        if (s[i] == "BC"){
            if (C[1] == 0) CB();
            else if (C[2] == 0) BC();
            else if (x == 2ll && C[1] == 1 && C[2] == 1){
                if (i == n-1 || s[i+1] == s[i]){
                    if (C[1] > C[2]) BC();
                    else CB();
                }
                else if (s[i+1] == "AB") CB();
                else BC();
            }
            else if (C[1] > C[2]) BC();
            else CB();
        }
        assert(C[0] >= 0 && C[1] >= 0 && C[2] >= 0);
    }
    printf("Yes\n");
    for (i = 0; i < n; i++){
        printf("%c\n",ans[i]+'A');
    }


}


Compiler output:
a.cc:17:1: error: 'voi' does not name a type; did you mean 'void'?
   17 | voi
      | ^~~
      | void
a.cc: In function 'int main()':
a.cc:22:5: error: 'x' was not declared in this scope
   22 |     x = (long long)C[0]+(long long)C[1]+(long long)C[2];
      |     ^