#include<bits/stdc++.h> using namespace std; int main (){ char a[152] ,s[152]; int n=0,d=0; cin >> a >> s; while(a[n] != '\0') { n++; } while(s[d] != '\0') { d++; } if(n==d) { cout <<"yes"; } else { cout << "no"; } return 0; }