#include<iostream>
using namespace std;
int i,j,n,k,a[26];
string s;
main(){
for(cin>>n>>k>>s;i<s.size();)a[s[i++]-‘a’]++;
for(i=0;j<26;)a[j++]>k?i=1:0;
cout<<(i?”NO\n”:”YES\n”);
}
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