input data to structure with scanf on c

People, i've tried to understand how to input and print the data to structure with terminal by scanf function...but it`s not working. I'm going to have my exam on c, and it is hard to understand for me. My code is bellow. When i run the code it cause some warning, like

First-chance exception at 0x59473FD4 (msvcr120d.dll) in Project2.exe: 0xC0000005: Access violation writing location 0x00749000.

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

struct icx 
{
    char nameprod[20]; 
    int year; 
};

struct icx a;

int main(){
    printf("Enter the data:\n");
    scanf_s("%s%d", a.nameprod, &a.year);
    printf("%s%d", a.nameprod, a.year);
    _getch();
    return 0;
}

Please I need your help.