nextLine(). Why am I getting this output? It's taking only 4 outputs when mentioned 5. And printing all 5 but the first one being blank

Question

''' import java.util.Scanner; ''' public class Input {

public static void main(String args[]) {
    Scanner sc = new Scanner(System.in);
    int num = sc.nextInt();
    String[] str = new String[num];
    for(int i = 0;i<num;i++){
        str[i] = sc.nextLine();
    }
    for(int x=0;x<num;x++){
        System.out.println("A and "+str[x]);

    }
}

} ''' Output:

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