recognizing the letters

#include <stdio.h>
#include <stdlib.h>

int main()
{
    char letter;
    printf("Program for recognizing the letters\n ");
    do
    {
        printf("\nEnter a letter: ");
        letter = getch();
        printf("\n You have entered the letter: % c", letter);
        switch(letter)
        {
            case 'a': case 'e': case 'i' : case 'o': case 'u': case 'y':
                printf("\n Vowel\n");
                break;
            case 'b': case 'c': case 'd' : case 'f': case 'g': case 'h':
            case 'j': case 'k': case 'l' : case 'm': case 'n': case 'p':
            case 'r': case 's': case 't' : case 'w': case 'z':
                printf("\n consonant\n");
                break;
            case 'q': case 'v': case 'x' :
                printf("\n foreign\n");
                break;
            default:
                printf("\n it was not a letter\n");
                break;

        }
        printf("\n If to continue (t/n)?");
        letter = getchar();
    }
    while ((letter == 'T')||(letter == 't'));

    return 0;
}