function Main(input){
  var d = input.split("\n");
  var a = d[0].split(".");
  var b = d[1].split(".");
  var f = 0;
  for(var i=0; i<3; i++){
    if(a[i]>=b[i]){
      f=1;
    } else {
      f=0;
      break;
    }
  }
  if(f==1){
    console.log("YES");
  } else {
    console.log("NO");
  }
}

Main(require("fs").readFileSync("/dev/stdin","utf-8"));