#include #include #include int main(){ char s[100]; int flag = 0; fgets(s,100,stdin); for(int i = 0;i < strlen(s);i++){ if((i%2 == 1)&&(s[i] != " "))flag = 1; else if((i%2 == 0)&&!(s[i] >= 97)&&!(s[i] <= 122))flag = 1; } if(flag == 1)printf("No\n"); else printf("Yes\n"); }