#include<iostream> #include<cstdio> #include<cstring> #include<cmath> using namespace std; int main(){ char a[151],b[151]; int i,a1,b1; cin>>a>>b; for(i=0;i<=151;i++){ if(a[i]=='\0'){ a1=i; break; } } for(i=0;i<=151;i++){ if(b[i]=='\0'){ b1=i; break; } } if(a1==b1){ cout<<"yes"; } else{ cout<<"no"; } return 0; }