process.stdin.resume();
process.stdin.setEncoding('utf8');

var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});
reader.on('line', (line) => {
    let d = line;
    let ans = "Christmas".padEnd((25 - d) * 4 + 9, " Eve");

    console.log(ans);
});
