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

struct Student{
    char surname[20];
    char name[20];
    char patronymic[20];
    char birthday[20];
    char number[20];
    char facultet[20];
    int kurs;
};

int main(){
    int count,i;
    printf("Please enter count students: ");
    scanf("%d",&count);
    struct Student student[count],temp;
    for(i = 0;i<count;i++){
        printf("Press Surname Name Patronymic Birthday Number Fackultet Kurs\n");
        scanf("%s %s %s %s %s %s %d",student[i].surname,student[i].name,student[i].patronymic,student[i].birthday,student[i].number,student[i].facultet,&student[i].kurs);
    }
    FILE *f;
    f = fopen("students.txt","w");
    fprintf(f,"Default:\n");
    for(i = 0;i<count;i++){
        fprintf(f,"%s %s %s %s %s %s %d\n",student[i].surname,student[i].name,student[i].patronymic,student[i].birthday,student[i].number,student[i].facultet,student[i].kurs);
    };

    for(i = 0;i<count;i++){
        if(strcmp(student[i].facultet,student[i-1].facultet)<0){
            temp = student[i];
            student[i] = student[i-1];
            printf("%s\n",student[i].surname);
            student[i-1] = temp;

        }
    }
    for(i = 0;i<count;i++){
        printf("%s %s %s %s %s %s %d\n",student[i].surname,student[i].name,student[i].patronymic,student[i].birthday,student[i].number,student[i].facultet,student[i].kurs);
        fprintf(f,"%s %s %s %s %s %s %d\n",student[i].surname,student[i].name,student[i].patronymic,student[i].birthday,student[i].number,student[i].facultet,student[i].kurs);
    };
    fclose(f);
}