#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[1000001],b[1000001]; int n; cin>>a; cin>>b; if(strcmp(a,b)!=0) cout<<"no"; else cout<<"yes"; return 0; }