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