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import java.util.List;
import java.util.ArrayList;
public class Ch2 {
public static void main(String[] args) {
ArrayList<String> list1 =
new ArrayList<>(List.of("ad","bd","aaab","baa","badab"));
ArrayList<String> list2 =
new ArrayList<>(List.of("a","b","c","ab","ac","bc","abc"));
ArrayList<String> list3 =
new ArrayList<>(List.of("cc","acd","b","ba","bac","bad","ac","d"));
System.out.println(consistent_strings(list1,"ab"));
System.out.println(consistent_strings(list2,"abc"));
System.out.println(consistent_strings(list3,"cad"));
}
private static int consistent_strings(List<String> list,
String allowed) {
int count = 0;
for(var str : list) {
boolean b = true;
for(var c : str.toCharArray()) {
if(allowed.indexOf(c) == -1) {
b = false;
break;
}
}
if(b) count++;
}
return count;
}
}
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