import java.util.Set; class Main { public static void main(String[] args) { System.out.print(removeVowels("asdfertyioplku")); } public static String removeVowels(String s){ StringBuilder sb = new StringBuilder(); Set<Character> charSet = Set.of('a','A','e','E','i','I','o','O','u','U'); for(char a : s.toCharArray()){ // if(a=='a'||a=='A'||a=='e'||a=='E'||a=='i'||a=='I'||a=='o'||a=='O'||a=='u'||a=='U'){ // continue; // } // else{ // sb.append(a); // } if(!charSet.contains(a)){ sb.append(a); } } return sb.toString(); } }