Thread: problem with letters

I have this code but it seems no matter what letter I choose it goes to if and not else:

Code:

void consonant()
{
	do
	{
		printf("Pick a letter: ");
			letter=getch();
		if (letter == 'a', 'e', 'i', 'o', 'u')
			printf("You can't pick a vowel choose again!!\n");
		else
			printf("\nYou choosed %c.\n\n", letter);
			valid = 1;
	}
	while(valid == 0);
	
	endturn = 0;
	winner = 0;
}

Thanks for the help