#include <stdio.h>
#define SIZE 31

int main()
{
    char data[SIZE];
    int i;
    
    printf("Enter a string of up to %d letters (upper and lowercase), NO spaces: ", (SIZE-1));
    scanf("%s", data);
    
    for(i = 0; i < SIZE; i++)
    {   
        if (data[i] != 0)
        {
            if ((data[i] == 97) || (data[i] == 101) || (data[i] == 105) || (data[i] == 111) || (data[i] == 117))
            {
                data[i] = data[i] - 32;
            }
        }
        else
        {
            break;
        }
    }
    
    printf("After processing, the string is: %s\n", data);
    
    return(0);
}