def solution(survey, choices):
answer = ''
result = {'RT':0, 'CF':0, "JM":0, "AN":0}
for s, c in zip(survey, choices):
if s not in result:
s = s[::-1]
result[s] += c - 4
else:
result[s] += 4 - c
for x in result :
val = result[x]
if val >= 0:
answer += x[0]
else:
answer += x[1]
return answer