let input = ['a', '1'];
let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);
let print = this.print || console.log;

let label = gets().charCodeAt(0);
let rank = +gets();

let result = (
  (label % 2 === 0 && rank % 2 === 0) || (label % 2 === 1 && rank % 2 === 1)
) ? 'dark' : 'light';

print(result);