C :

int main(int argc, char* argv[])
{int l,i;
char a[51];
while(~scanf("%s",&a))
{
l=strlen(a);
for(i=0;i<l;i++){if(a[i]>='A'&&a[i]<='Z')a[i]+=32;}
for(i=0;i<l;i++){if(a[i]=='a'||a[i]=='e'||a[i]=='i'||a[i]=='o'||a[i]=='u')a[i]-=32;printf("%c",a[i]);}
printf("\n");
} return 0; }