function randomInt(max) {
  return Math.floor(Math.random() * max);
}

const CHARS = "abcdefghijklmopqrstuvwxyz";
function randomChar() {
  const n = randomInt(25);
  return CHARS.charAt(n);
}

function generateWord(firstChar) {
  const len = randomInt(18) + 2;
  const result = [];
  if (firstChar) {
    result.push(firstChar);
  }
  while (result.length < len) {
    result.push(randomChar());
  }
  return result.join("");
}

function Main(input) {
    var data = input.split("\n")
    var n = parseInt(data[0]);
    var map = {};
    var ret = [];
    var firstChar = null;
    while (ret.length < n) {
      var s = generateWord(firstChar);
      if (!map[s]) {
        map[s] = true;
        ret.push(s);
        firstChar = s.charAt(s.length - 1);
      }
    }
    ret[ret.length -1] += "n";
    ret.forEach(v => console.log(v));
}

// Don't edit this line!
Main(require("fs").readFileSync("/dev/stdin", "utf8"));