#include <stdio.h>
#include <string.h>

int main() {
    char buf[100], temp_buf[100], name[50], 
        *temp, *ss;

    int a = 0, cnt = 0, 
        thr_wrd_len, len;

    memset(buf, 0, 100);

    gets(buf);

    temp = buf;

    while (*temp) {
        if (*temp == 'a' || *temp == 'A')
            a++;
        temp++;
    }

    memcpy(temp_buf, buf, 100);

    memset(name, 0, 50);

    ss = strtok(temp_buf, " ");

    do {
        ss = strtok(NULL, " ");
        cnt++;

        if (cnt == 1)
            memcpy(name, ss, strlen(ss));

        if (ss && cnt == 2)
            thr_wrd_len = strlen(ss);
    } while (ss);


    len = strlen(buf);

    printf("Surname Name Patronymic: %s\n"
           "Surname Name Patronymic len: %d\n"
           "'a': %d\n"
           "Name: %s\n"
           "Three word len: %d\n", 
           buf, len, a, name, thr_wrd_len);

    return 0;
}

#include <stdio.h>
#include <string.h>

#define SIZE_PIB 3
#define SYM_SRCH_LOW 'a'

enum { Surname, Name, Patronymic };


int get_words(char **arr, char *src, char *dst) {
    int i = 0;

    memcpy(dst, src, strlen(src) + 1);

    char *p = strtok(dst, " ");
    arr[i++] = p;

    do {
        p = strtok(NULL, " ");

        if (p)
            arr[i++] = p;
    } while (p);

    return i;
}

int get_a(char *src) {
    char *temp = src;
    int a = 0;

    while (*temp) {
        if (*temp == SYM_SRCH_LOW || *temp == toupper(SYM_SRCH_LOW))
            a++;
        temp++;
    }

    return a;
}


int main() {
    char buff[100],
        dst[100];

    char *share[SIZE_PIB];

    printf("Enter please full name. Example: Parashenka Petr Alekseevich\n");

    while (1) {
        int pib_len;
        gets(buff);

        if ((pib_len = get_words(share, buff, dst)) != SIZE_PIB)
            printf("reenter please\n");
        else
            break;
    }

    printf("PIB: %s\n"
           "PIB len: %d\n"
           "'a': %d\n"
           "Name: %s\n"
           "Three word len: %d\n",
           buff, strlen(buff), get_a(buff), share[Name], strlen(share[Patronymic]));

    return 0;
}