#include<iostream> using namespace std; int main(){ char a[151]; char b[151]; cin>>a>>b; int n,m; int i=0; n = 0; while(a[i]!='\0'){ n++; i++; } m = 0; i = 0; while(b[i]!='\0'){ m++; i++; } if(n==m){ cout<<"yes"; } else{ cout<<"no"; } return 0; }