def findGray(array):
    awnsers = ["*", "A", "B", "C", "D", "E"]
    found = 0
    index = 0
    for i,num in enumerate(array):
        if num < 128:
            found += 1
            index = i+1 
    if found > 1:
        return "*"
    else:
        return awnsers[index]

n = 1;
while n != 0:
    n = int(input())
    for i in range(0,n):
        numbers_array = [int(num) for num in input().split()]
        print(findGray(numbers_array))