from math import factorial
def lint(n):
    if n==int(n):
        return int(n)
    else:
        return int(n)+1
word='abcdefghijklm'
li=[]
for i in sorted(word):
    li.append(i)

def answer_calc(pos,lis):
    answer=''
    for i in range(len(word)-1,-1,-1):
        index=lint(pos/factorial(i))-1
        answer+=lis.pop(index)

        pos+=-(index)*factorial(i)

    return answer
for _ in range(int(input())):
    n=int(input())
    print(answer_calc(n,li[:]))