def check_conditions(S):
    if not set(S).issubset({'A', 'B', 'C'}):
        return False

    while 'ABC' in S:
        S = S.replace('ABC', '')
    if S != '':
        return False
    S = 'ABC' * N
    while 'A' in S and 'B' in S and 'C' in S:
        S = S.replace('A', '', 1)
        S = S.replace('B', '', 1)
        S = S.replace('C', '', 1)
    if S != '':
        return False
    if 'AA' in S or 'BB' in S or 'CC' in S:
        return False

    return True

T = int(input())
for _ in range(T):
    N = int(input())
    S = 'ABC' * N
    print(S)