#include<bits/stdc++.h>

using namespace std;

string s;

long long int sum;

int main(){

cin>>s;

int l,m,o;

cin>>l>>m;

cin>>o;

for(int i=l-1;i<=m;i++){

	sum+=s[i];

}

if(sum>o){

	cout<<"yes";

}else cout<<"no";

return 0;

}

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