#include<bits/stdc++.h> using namespace std; int main(){ char a[151],b[151]; int al,bl; cin >> a >> b; al = 0; bl = 0; for(int i = 0;i < 151;i++){ if(a[i] != '\0'){ al++; }else{ break; } } for(int j = 0;j < 151;j++){ if(b[j] != '\0'){ bl++; }else{ break; } } if(al != bl){ cout << "no"; }else{ cout << "yes"; } return 0; }