Help me in solving LBCP06D problem what is in printf statement how and why it can be fill?

help
,
1

My issue

My code

// Update the '_' below to solve the problem

#include <stdio.h>

int main() {
    int N = 10;
    int X = 4;
    int option1 = X;
    int option2 = N - X;
    printf("%d\n", option1 < option2 ? _: X);

    X = 6;
    option1 = X;
    option2 = N - X;
    printf("%d\n", option1 < option2 ? _: _);

    return 0;
}

Learning course: C for problem solving - 1
Problem Link: CodeChef: Practical coding for everyone