#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){ int w = 1; for(int i = 0;i < la;i++){ if(a[i] != b[i]){ w = 0; } } if(w == 0){ cout<<"no"; }else{ cout<<"yes"; } }else{ cout<<"no"; } return 0; }