#include <stdio.h>
#include <ctype.h>

int main(void)
{
    int i;
    char full_name[100 + 1];
    char *first_letter, *last_name;

    printf("Enter your name: ");
    gets(full_name);

    first_letter = full_name;
    for (i = 0; full_name[i] != '\0'; ++i)
        if (full_name[i] == ' ')
        {
            printf("%c. ", toupper(*(first_letter)));
            first_letter = &(full_name[i + 1]);
        }

    putchar(toupper(*(first_letter++)));
    for (last_name = first_letter; *(last_name) != '\0'; ++last_name)
        putchar(tolower(*(last_name)));
    putchar('\n');

    return 0;
}