T = int(input())
ANS5='ABDCC'
ANS10='BBCCCFACAC'
ANS21='ACCACCCCCCCCABACAAFFE'
for _ in range(T):
    N = int(input())
    if N%21==0:
        print(ANS21*(N//21))
    elif N%21==5:
        print(ANS5+ANS21*(N//21))
    elif N%21==10:
        print(ANS10+ANS21*(N//21))
    else:
        print(-1)