import std.stdio;
import std.string;
import std.conv;
import std.algorithm;
import std.range;
import std.array;

/// main =============
void main(){
  auto v1 = readln.strip.split(".").map!(to!int).array;
  auto v2 = readln.strip.split(".").map!(to!int).array;
  writeln( v2[] <= v1 ? "YES" : "NO");
}