#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char a,x,y; cin>>a>>x>>y; if (a>=x && a<=y){ cout<<"no"; } else { cout<<"yes"; } return 0; }