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