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