#include<bits/stdc++.h> using namespace std; int main(){ string s1,s2; cin>>s1>>s2; int n1=0; while(s1[n1]){ n1++; } int n2=0; while(s2[n2]!='\0'){ n2++; } if(n1==n2){ cout<<"yes"; }else{ cout<<"no"; } return 0; }