#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 s[1000],d[1000]; cin>>s>>d; int n=strcmp(s,d); if(n==0) cout<<"yes"<<endl; else cout<<"no"<<endl; return 0; }