package test;

import java.io.*;

import java.util.*;

public class AtCoder183 {

static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

public static int nextInt() throws IOException {

return Integer.parseInt(br.readLine());

}

public static long nextLong() throws IOException {

return Long.parseLong(br.readLine());

}

public static String next() throws IOException {

return br.readLine();

}

public static int[] sortArr(int arr[]) throws IOException {

ArrayList<Integer> a = new ArrayList<Integer>();

for (int i : arr)

a.add(i);

Collections.sort(a);

for (int i = 0; i < a.size(); i++)

arr[i] = a.get(i);

return arr;

}

public static int[] desortArr(int arr[]) throws IOException {

ArrayList<Integer> a = new ArrayList<Integer>();

for (int i : arr)

a.add(i);

Collections.sort(a, Collections.reverseOrder());

for (int i = 0; i < a.size(); i++)

arr[i] = a.get(i);

return arr;

}

public static int[] nextArr() throws IOException {

String elements[] = br.readLine().split(" ");

int arr[] = new int[elements.length];

for (int j = 0; j < elements.length; j++)

arr[j] = Integer.parseInt(elements[j]);

return arr;

}

public static void printArr(char arr[]) {

for (int i = 0; i < arr.length; i++)

System.out.print(arr[i] + " ");

}

public static void main(String[] args) throws IOException {

int T = 1;

T = nextInt();

char arr[] = new char[27];

for (int i = 1; i < arr.length; i++)

arr[i] = (char) (96 + i);

while (T-- > 0) {

long n = Long.parseLong(next());

String s = "";

while (n > 0) {

n -= 1;

s += (char) (97 + n % 26);

n = n / 26;

}

System.out.println(new StringBuilder(s).reverse());

}

}

}