var arr = "";
var n = 3;
var num = 0;
for (var i = 0 ;i < n; i++){
	arr = prompt(i+1);
}
var arrn = arr.split("");
for (var j = 0 ; j<arrn.length ; j++){
	num = parseInt(arrn[j]);
  	num += num;
}
if(num>=22){
	print("burst");
}
else{
  print("win");
}