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

int main() {
    int A, B;
    scanf("%d%d", &A, &B);
    int brojac = A;
    while(brojac <= B) {
        if(brojac % 2 == 0) {
            printf("%d ", brojac);
        }
        
        brojac++;
    }
    
    
    return 0;
}