#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<bitset>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<deque>
#include<list>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<functional>
using namespace std;

#define repr(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(i, n) repr(i, 0, n)
#define INF 2e9
#define MOD 1000000007
//#define MOD 998244353
#define LINF (long long)4e18
#define jck 3.141592

using ll = long long;
using Pi = pair<int,int>;
using Pl = pair<ll,ll>;

int main(){
    string S; cin >> S;
    bool ok = true;
    rep(i,S.size()){
        if(i % 2 == 0){
            if(S[i] == ' ') ok = false;
        }
        else{
            if(S[i] != ' ') ok = false;
        }
    }
    cout << (ok ? "Yes" : "No") << endl;
 

}