package Basic_Syntax.MoreExercises;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.LinkedHashMap;
import java.util.Map;

public class P6_MessagesMapSolution {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        Map<String, String> letters = new LinkedHashMap<>();

        char letter = 'a';
        for (int i = 2; i <= 9; i++) {
            if (i == 7 || i == 9) {
                String number = i + "";
                for (int j = 1; j <= 4; j++) {
                    letters.put(number, letter + "");
                    number += i;
                    letter++;
                }
            } else {
                String number = i + "";
                for (int j = 1; j <= 3; j++) {
                    letters.put(number, letter + "");
                    number += i;
                    letter++;
                }
            }

        }


        int n = Integer.parseInt(reader.readLine());
        letters.put("0"," ");

        String result = "";
        for (int i = 0; i < n; i++) {
            String line = reader.readLine();
            result += letters.get(line);
        }

        System.out.println(result);


    }
}