Saimum

#include<bits/stdc++.h>
using namespace std;

void cas(int i) {
    cout<<"Case "<<i<<":";
}

typedef vector<int> vi;
typedef vector<long long> vll;
typedef pair<int,int> pii;
typedef vector< pii > vii;

#define ll          long long
#define ff          first
#define ss          second
#define pb          push_back
#define mkp         make_pair
#define sz          size()
#define dsc         greater<int>()

#define fef(i,a,b)    for(int i=a;i<b;i++)
#define feb(i,a,b)    for(int i=a;i>=b;i--)
#define all(a)      a.begin(),a.end()
#define mem(a,b)    memset(a,b,sizeof(a))
#define pi          2*acos(0.0)
#define End         return 0;

#define scan1(a)    scanf("%d",&a)
#define scan2(a,b)  scanf("%d %d",&a,&b)
#define scan3(a,b,c)  scanf("%d %d %d",&a,&b,&c)
#define scanl(a)    scanf("%lld",&a)
#define scanll(a,b) scanf("%lld %lld",&a,&b)
#define scanlll(a,b,c) scanf("%lld %lld %lld",&a,&b,&c)

#define print1(a)    printf("%d",a)
#define print2(a,b)  printf("%d %d",a,b)
#define print3(a,b,c)  printf("%d %d %d",a,b,c)
#define printl(a)    printf("%lld",a)
#define printll(a,b) printf("%lld %lld",a,b)
#define printlll(a,b,c) printf("%lld %lld %lld",a,b,c)

#define MAXN        1000000007
#define INF 0x3f3f3f3f
bool sbs(const pii &a, const pii &b) {
    return (a.second < b.second);
}
//int dx[]={+1,-1,+0,+0};///Four Directions
//int dy[]={+0,+0,+1,-1};///Four directions
//int dx [] = {+1,-1,+0,+0,-1,-1,+1,+1};///Eight Directions
//int dy [] = {+0,+0,+1,-1,+1,-1,-1,+1};///Eight Directions

//int mark[10007];vi prime;void seive(){for(int i=2;i<10000;i++){if(mark[i]==0){prime.pb(i);for(int j=i+i;j<=10000;j+=i)mark[j]=1;}}}

//freopen("input.txt", "r", stdin);

int main()
{
   //ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
   cout<<"Enter starting and ending number respectively: "<<endl;
   long long start, endd; cin>>start>>endd;
   for(int i=start; i<=endd; i+=4){
    cout<<i<<endl;
    if(i+1>endd) break;
    cout<<i+1<<endl;
   }

   End;
}