#include <bits/stdc++.h>                                             
                                                                     
using namespace std;                                                 
                                                                     
int main() {                                                         
                                                                     
    int a, b, isNA;                                                  
                                                                     
    while(cin >> a >> b && (a || b)) {                               
                                                                     
        isNA = 1;                                                    
                                                                     
        for(int i = a; i <= b; ++i) {                                
            if(i == 0) {                                             
                continue;                                            
            }                                                        
            if(i % 400 == 0 || (i % 4 == 0 && i % 100 != 0)) {       
                cout << i << endl;                                   
                isNA = 0;                                            
            }                                                        
        }                                                            
                                                                     
        if(isNA == 1) {                                              
            cout << "NA" << endl;                                    
        }                                                            
                                                                     
    }                                                                
                                                                     
}                                                                    