function main(input) {
  const [s] = input;
  const arr = [];
  walk("kadomatsu", 0, "", arr);
  console.log(arr.indexOf(s) >= 0 ? "yes" : "no");
}

function walk(s, i, v, arr) {
  arr.push(v);
  if(i >= s.length) return;
  for(let j=i; j<s.length; j++) {
    walk(s, j+1, v + s[j], arr);
  }
}

main(require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n"));