#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,n,k,j,m;
	bool l=0;
	cin>>n>>k;
	int a[n];
	for(i=1;i<=n;i++)
		cin>>a[i-1];
	for(i=1;i<=n;i++){
		for(j=1;j<=n-i;j++){
			if(a[i-1]<a[i])
				swap(a[i-1],a[i]);
		}
	}	
	m=a[n-k]-a[k-1];
	for(i=2;i<=k;i++){
		if(m==2){
			l=1;break;} 
		if(m==i)
			l=1;break;
	}
	if(l==1)
		cout<<"YES"<<endl;
	else
		cout<<"NO"<<endl;
	cout<<m;
	
	
	return 0;
	}

/**************************************************************
	Problem: 1242
	User: fzy001
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/