#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i,k,a[110]={0},j,b,c,h=0;
	cin>>n>>k;
	for(i=0;i<n;i++){
		cin>>a[i];
	}
	for(i=n-1;i>0;i--){
		for(j=0;j<i;j++){
			if(a[j]<a[j+1]){
				swap(a[j],a[j+1]);
			}
		}
	}
	b=a[k-1];
	for(i=n-1;i>0;i--){
		for(j=0;j<i;j++){
			if(a[j]>a[j+1]){
				swap(a[j],a[j+1]);
			}
		}
	}
	c=a[k-1];
	for(i=2;i<(b-c);i++){
		if((b-c)%2==0){
			h++;
		}
	}
	if(h!=0){
		cout<<"NO"<<endl;
	}else{
		cout<<"YES"<<endl;
	} 
	cout<<abs(b-c);
}
/**************************************************************
	Problem: 1242
	User: linzihang
	Language: C++
	Result: Accepted
	Time:25 ms
	Memory:2072 kb
****************************************************************/