COROANA TE ROG!!!
char s[21]="", voc[]="aeiouAEIOU";
for(int i=0;i<strlen(voc);i++)
if(strchr(s, voc[i])==NULL)
cout<<voc[i];
SAU
char s[21]="", voc[]="aeiouAEIOU";
int sem;
for(int i=0;i<strlen(voc);i++){
sem=0;
for(int j=0;j<strlen(s);j++)
if(s[j]==voc[i])
sem=1;
if(sem==0)
cout<<voc[i];
}