#include <bits/stdc++.h>
#include <string.h>
#define rep(i,n) for(int i = 0; i < n; i++)
#define srep(i,a,b) for(int i = a; i < b; i++)
#define all(A) (A).begin(),A.end()
#define MOD 1000000007
using namespace std;
using ll = long long;
using P = pair<int,int>;
using Graph = vector<vector<int>>;

int main(void){
	string s; getline(cin,s);

	bool ok = 1;
	rep(i,(int)s.size()){
		if((i+1)%2 != 0 && s[i] == ' ') ok = 0;
		else if((i+1)%2 == 0 && s[i] != ' ') ok = 0;
	}
	cout << (ok ? "Yes" : "No");
}