#include<bits/stdc++.h> using namespace std; int main(){ char s1[150],s2[150]; int a=0,b=0; cin>>s1>>s2; while(s1[a]!='\0'){ a++; } while(s2[b]!='\0'){ b++; } if(a == b) cout<<"yes"; else cout<<"no"; return 0; }