#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char a[101],b[101]; cin>>a>>b; int n=strlen(a); int n1=strlen(b); if(n==n1){ cout<<"yes"<<endl; } else{ cout<<"no"<<endl; } return 0; }