#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[150],b[150]; cin>>a>>b; if(strlen(a)==strlen(b)) cout<<"yes"<<endl; else cout<<"no"<<endl; return 0; }