#include <bits/stdc++.h>
using namespace std;

signed main(){
  string ans[] = { "NO", "YES" };
  string v1, v2; cin >> v1 >> v2;
  if( v1[ 0 ] != v2[ 0 ] )
    cout << ans[ v2[ 0 ] <= v1[ 0 ] ] << endl;
  else if( v1[ 2 ] != v2[ 2 ] )
    cout << ans[ v2[ 2 ] <= v1[ 2 ] ] << endl;
  else if( v1[ 4 ] != v2[ 4 ] )
    cout << ans[ v2[ 4 ] <= v1[ 4 ] ] << endl;
  else
    cout << "YES" << endl;
  return 0;
}