题解 | 牛牛的考试

n = int(input())
result = ['A','B','C','D']
for i in range(n):
    l = [input().strip() for i in range(4)]
    length = []
    for i in l:
        length.append(len(i))  

    min_len = min(length)
    count_min = sum(1 for l in length if l== min_len)
    
    max_len = max(length)
    count_max = sum(1 for l in length if l== max_len)

    if count_min ==1 and count_max !=1:
        print(result[length.index(min_len)])
    elif count_max ==1 and count_min !=1:
        print(result[length.index(max_len)])
    else:
        print('C')