#include<iostream> #include<cstring> using namespace std; int main() { char a[1001],b[1001]; cin>>a>>b; int la=strlen(a); int lb=strlen(b); if(la != lb){ cout<<"no"; } else{ int flag = 1; for(int i=0;i<la;i++){ if(a[i] != b[i]){ flag = 0; } } if(flag == 1){ cout<<"yes"; } else{ cout<<"no"; } } return 0; }