#include <bits/stdc++.h> using namespace std; int main (){ char a[152],b[152]; int num1=0,num2=0; cin>>a>>b; while(a[num1]!='\0'){ num1++; } while(b[num2]!='\0'){ num2++; } if(num1==num2){ cout<<"yes"; }else{ cout<<"no"; } return 0; }