#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[1001],b[1001]; int c,d,e=0; cin>>a>>b; d=strcmp(a,b); if(d==0) cout<<"yes"; else cout<<"no"; return 0; }