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