#include<bits/stdc++.h> using namespace std; char a[151],b[151]; int main(){ int n=0,m=0,x=0; cin>>a>>b; while(a[n]!='\0'){ n++; x++; } x=0; while(b[m]!='\0'){ m++; x++; } if(n!=m){ cout<<"no"; return 0; } cout<<"yes"; return 0; }