#include<stdio.h>
#include<ctype.h>
int main(){
    int n,arr[i];
    scanf("%d \n%d",&n,&arr[i]);
    if(n<0 || arr[i]<0){
        printf("Invalid Input");
    }
    for(int i=1;i=arr[i];i++){
        if(i%2==0){
            printf("%d ",i);
        }else if(i%2!=0){
            printf("\n%d ",i);
        }
    }
    return 0;
}