#include #include #include using namespace std; typedef long long ll; typedef pair P; signed main(){ string s; bool usi=true; getline(cin,s); cout << s << endl; for(int i=0;s[i]!=0;i++){ if(i%2==0){ if('a'>s[i]||s[i]>'z'){ usi = false; break; } }else{ if(s[i]!=' '){ usi=false; break; } } } if(usi){ cout <<"Yes\n"; }else{ cout <<"No\n"; } }