#include <stdio.h>
#include <string.h>
#include <stdbool.h>
int main(void) {
    int sym = 0, count = 0, counter = 0;
    char str1[1024] = "12345";
    char str2[1024] = "12375";
    if (strcmp(str1, str2) == 0)
        puts("Строки идентичны");
    else
        puts("Строки отличаются");

    printf("%d", strlen(str1));
    for (int i = 0; i < strlen(str1); i++) {
        if (str1[i] == '3')
            count++;
    }
    printf("%d", count);
    int maxlen = 0;
    for (int i = 0; i < strlen(str1); i++) {
        bool otrezok = false;
        for (int j = 0; j < strlen(str2); j++) {
            if (str1[i] == str2[j])
                otrezok = true;
        }
        if (!otrezok)
            ++counter;
        if (otrezok && counter > 0) {
            if (maxlen < counter) {
                maxlen = counter;
            }
            counter = 0;
        }


    }
    printf("%d", maxlen);

    const char *first  = "first";
    const char *second = "second";
    char third[512];
    snprintf(third, sizeof third, "%s%s", first, second);