text: 'use strict';
  
  process.stdin.resume();
  process.stdin.setEncoding('utf-8');
  
  let inputString = '';
  let currentLine = 0;
  
  process.stdin.on('data', inputStdin => {
      inputString += inputStdin;
  });
  
  process.stdin.on('end', _ => {
      inputString = inputString.trim().split('\n').map(string => {
          return string.trim();
      });
  
      main();
  });
  
  function readLine() {
      return inputString[currentLine++];
  }
  
  function getLetter(s) {
      let letter;
      var firstLetter = s.charAt(0);
      switch (firstLetter) {
          case 'a':
          case 'e':
          case 'i':
          case 'o':
          case 'u':
              letter = 'A';
              break;
          case 'b':
          case 'c':
          case 'd':
          case 'f':
          case 'g':
              letter = 'B';
              break;
          case 'h':
          case 'j':
          case 'k':
          case 'l':
          case 'm':
              letter = 'C';
              break;
          default:
              letter = 'D';
  
      }
  
      return letter;
  }
  