Code1

#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main(int argc, char* argv[])
{
  int result = 0;
  int len = strlen(argv[1]);
  for(int i=0; i<len; ++i) {
    char c = tolower(argv[1][i]);
    if(c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u') {
      ++result;
    }
  }
  printf("%d\n", result);
  return 0;
}