count=False
for _ in range(int(input())):
    n=int(input())-1
    i=1
    array=[]
    while n!=0:
        a=n%i
        n=n//i
        # print(n,i,a)
        array.insert(0,a)
        i=i+1
    arraychar=['a','b','c','d','e','f','g','h','i','j','k','l','m']
    if len(array)<len(arraychar):
        for _ in range(len(arraychar)-len(array)):
            array.insert(0,0)
    newarray=[]
    for i in array:
        newarray.append(arraychar[i])
        arraychar.pop(i)
    if count:
        print("")
    for i in newarray:
        print(i,end="")
    count=True