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

struct kor {
  char name[30];
  int age;
};

int foo(FILE *f)
{
    const void *a;
    const void *b;
    struct hallgato *pa = (struct hallgato *)a;
    struct hallgato *pb = (struct hallgato *)b;
    int res=0;
    if((pa->age) < (pb->age))
        res=-1;
    else if((pa->age) > (pb->age))
        res=1;
    return res;
}