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