// https://bbc3502.hopto.org/c2021/index.php/home-17/590-3
#include <stdio.h>

//将只包含小写字母的字符串str中的元音字母复制到字符数组vowel,并返回元音字符的个数。
int getVowel(char str[], char vowel[]);

int main() {
  char vowel[101], str[101]; //每个数组都至少要101个字节
  int len;

  scanf("%s", str);           //读入字符串
  len = getVowel(str, vowel); //复制
  if (len > 0)
    printf("%d %s\n", len, vowel); //输出复制后结果
  else
    printf("%d\n", len); //仅输出长度

  return 0;
}

/* 请在这里填写答案 */
#include <string.h>
#pragma GCC optimize("Ofast,inline")
int getVowel(char str[], char vowel[]) {
  char vowelstr[] = {'a', 'e', 'i', 'o', 'u'};
  int len = 0;
  for (int i = 0, n = strlen(str); i < n; i++) {
    for (int j = 0, m = sizeof(vowelstr) / sizeof(char); j < m; j++) {
      if (vowelstr[j] == str[i]) {
        vowel[len++] = str[i];
      }
    }
  }
  // vowel[len] is a trash value, and will lead to undefined behavior in some
  // cases
  vowel[len] = '\0';
  return len;
}