#include<iostream> using namespace std; int main(){ char a[150],b[150]; cin>>a>>b; int al=0,bl=0; int i=0; while(a[i]!='\0'){ al++; i++; } i=0; while(b[i]!='\0'){ bl++; i++; } if(al==bl){ cout<<"yes"; } else{ cout<<"no"; } return 0; }