#include<iostream> using namespace std; int main(){ char a[151],b[151]; int asl,bsl; cin>>a>>b; for(int i=0;i<=151;i++){ if(a[i]=='/0'){ asl=i; break; } } for(int i=0;i<=151;i++){ if(b[i]=='/0'){ bsl=i; break; } } if(bsl==asl){ cout<<"yes"; } else{ cout<<"no"; } return 0; }