#include<bits/stdc++.h> using namespace std; int main(){ string s1,s2; int num1=0,num2=0; cin>>s1>>s2; while(s1[num1]!='\0'){ num1++; } while(s2[num2]!='\0'){ num2++; } if(num1==num2){ cout<<"yes"; }else{ cout<<"no"; } }