i don't understand why it doesn't work. Can somebody solve this problem

#include<stdio.h>

int main(void)
{
int a, b;

a = 5;
b = 1;
printf("The sum is: %d", (a + b));

return 0;
}

You should read a and b from console and print just sum without anything else. read rules

#include <stdio.h>
main()
{
   int a, b;
   scanf("%d%d", &a, &b);
   printf("%d\n", a + b);
}
This is code correct and C