import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1]
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
def f(l):
idx = []
for i in range(5):
if l[i] <= 127:
idx.append(i)
if len(idx) != 1:
return "*"
return chr(idx[0] + 65)
while 1:
n = ii()
if n == 0:
break
l = [mii() for _ in range(n)]
for i in l:
print(f(i))