import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.nextLine(); int[] total = new int[26]; for (int i = 0; i < str.length(); i++) { total[str.charAt(i) - 'a']++; } int minCount = 21; StringBuilder sb = new StringBuilder(); for (int i = 0; i < 26; i++) { if (total[i] > 0 && total[i] < minCount) { minCount = total[i]; } } for (int i = 0; i < str.length(); i++) { if (total[str.charAt(i) - 'a'] != minCount) { sb.append(str.charAt(i)); } } System.out.println(sb); } }