//include //------------------------------------------ #include using namespace std; //typedef //------------------------------------------ typedef long long LL; typedef vector VL; typedef vector VVL; typedef vector VS; typedef pair PLL; //container util //------------------------------------------ #define ALL(a) (a).begin(),(a).end() #define RALL(a) (a).rbegin(), (a).rend() #define PB push_back #define MP make_pair #define SZ(a) int((a).size()) #define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i) #define EXIST(s,e) ((s).find(e)!=(s).end()) #define SORT(c) sort((c).begin(),(c).end()) //constant //-------------------------------------------- const double EPS = 1e-10; const double PI = acos(-1.0); const int MOD = 1000000007; // grid //-------------------------------------------- VL dx = {0, 1, 0, -1}; VL dy = {1, 0, -1, 0}; VL dx2 = {-1, 0, 1, -1, 1, -1, 0, 1}; VL dy2 = {-1, -1, -1, 0, 0, 1, 1, 1}; //debug //-------------------------------------------- #define dump(x) cerr << #x << " = " << (x) << endl; #define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl; //IO accelerate //-------------------------------------------- struct InitIO { InitIO() { cin.tie(nullptr); ios_base::sync_with_stdio(false); cout << fixed << setprecision(30); } } init_io; //template //-------------------------------------------- template istream& operator >>(istream& is, vector& vec) { for(T& x: vec) is >> x; return is; } template ostream& operator <<(ostream& os, const vector& vec) { for(int i=0; i ostream& operator <<(ostream& s, const vector>& vv) { for (int i = 0; i < vv.size(); ++i) { s << vv[i] << endl; } return s; } // 多重vector // auto dp=make_v(4,h,w) みたいに使える template vector make_v(size_t a){return vector(a);} template auto make_v(size_t a,Ts... ts){ return vector(ts...))>(a,make_v(ts...)); } // 多重vectorのためのfill // fill_v(dp,0) みたいに使える template typename enable_if::value==0>::type fill_v(T &t,const V &v){t=v;} template typename enable_if::value!=0>::type fill_v(T &t,const V &v){ for(auto &e:t) fill_v(e,v); } //main code int main(int argc, char const* argv[]) { char c; for (int i = 0; cin >> c; i++) { if ((i%2==0 and c == ' ') or (i%2==1 and c != ' ')) { cout << "No" << endl; return 0; } } cout << "Yes" << endl; return 0; }