Language: C

N, A, B, C = map(int, input().split())
ss = [input() for _ in range(N)]
history = []

hashing = {"AB": 6, "BC": 3, "AC": 5}
appeared = {"AB": False, "BC": False, "AC": False}

connected = hashing[ss[0]]
appeared[ss[0]] = True
for i in range(1, N):
    connected ^= hashing[ss[i]]
    if connected == 3:
        appeared["AB"] = True
    elif connected == 5:
        appeared["AC"] = True
    elif connected == 6:
        appeared["BC"] = True

flg = True

if A == 0 and B == 0 and C == 0:
    flg = False
elif A == 0 and B == 0:
    if not appeared["AB"]:
        flg = False
elif B == 0 and C == 0:
    if not appeared["BC"]:
        flg = False
elif C == 0 and A == 0:
    if not appeared["AC"]:
        flg = False
else:
    for s in ss:
        if s == "AB":
            if A > B:
                history.append('B')
                A -= 1
                B += 1
            else:
                history.append('A')
                A += 1
                B -= 1
        elif s == "AC":
            if A > C:
                history.append('C')
                A -= 1
                C += 1
            else:
                history.append('A')
                A += 1
                C -= 1
        elif s == "BC":
            if B > C:
                history.append('C')
                B -= 1
                C += 1
            else:
                history.append('B')
                B += 1
                C -= 1
        if A < 0 or B < 0 or C < 0:
            flg = False
            break
        
        
if flg:
    print("Yes")
    print(*history, sep = '\n')
else:
    print("No")

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | N, A, B, C = map(int, input().split())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'N' [-Wimplicit-int]
main.c:1:4: error: type defaults to 'int' in declaration of 'A' [-Wimplicit-int]
    1 | N, A, B, C = map(int, input().split())
      |    ^
main.c:1:7: error: type defaults to 'int' in declaration of 'B' [-Wimplicit-int]
    1 | N, A, B, C = map(int, input().split())
      |       ^
main.c:1:10: error: type defaults to 'int' in declaration of 'C' [-Wimplicit-int]
    1 | N, A, B, C = map(int, input().split())
      |          ^
main.c:1:14: error: implicit declaration of function 'map' [-Wimplicit-function-declaration]
    1 | N, A, B, C = map(int, input().split())
      |              ^~~
main.c:1:18: error: expected expression before 'int'
    1 | N, A, B, C = map(int, input().split())
      |                  ^~~
main.c:2:1: error: expected ',' or ';' before 'ss'
    2 | ss = [input() for _ in range(N)]
      | ^~
main.c:6:1: warning: data definition has no type or storage class
    6 | appeared = {"AB": False, "BC": False, "AC": False}
      | ^~~~~~~~
main.c:6:1: error: type defaults to 'int' in declaration of 'appeared' [-Wimplicit-int]
main.c:6:13: error: initialization of 'int' from 'char *' makes integer from pointer without a cast [-Wint-conversion]
    6 | appeared = {"AB": False, "BC": False, "AC": False}
      |             ^~~~
main.c:6:13: note: (near initialization for 'appeared')
main.c:6:13: error: initializer element is not computable at load time
main.c:6:13: note: (near initialization for 'appeared')
main.c:6:17: error: expected '}' before ':' token
    6 | appeared = {"AB": False, "BC": False, "AC": False}
      |            ~    ^
main.c:8:1: error: expected ',' or ';' before 'connected'
    8 | connected = hashing[ss[0]]
      | ^~~~~~~~~