#include<iostream> #include<cstring> using namespace std; int main(){ char a[1002],b[1002]; cin>>a>>b; int s1=strlen(a); int s2=strlen(b); if(s1!=s2){ cout<<"no"; return 0; } else{ for(int i=1;i<=s1;i++){ if(a[i]==b[i]){ cout<<"yes"; return 0; } else{ cout<<"no"; return 0; } } } return 0; }