#include<iostream> 
#include<cstdio>
#include<cstring>
#include<vector>
#include<queue>
#include<algorithm>
#include<stack>
#include<cmath>
#include<bits/stdc++.h>
using namespace std;

long long a,b;

int YE5()
{
	cout<<"YE5";
} 
int N0()
{
	cout<<"N0";
}

int main()
{
	ios::sync_with_stdio(false);
	cin>>a>>b;
	if(a<=b) YE5();
	else N0();
}

#include<iostream> 
#include<cstdio>
#include<cstring>
#include<vector>
#include<queue>
#include<algorithm>
#include<stack>
#include<cmath>
#include<bits/stdc++.h>
using namespace std;

long long a,b;

void YE5()
{
	cout<<"YE5";
} 
void N0()
{
	cout<<"N0";
}

int main()
{
	ios::sync_with_stdio(false);
	cin>>a>>b;
	if(a<=b) YE5();
	else N0();
}

#include<iostream> 
#include<cstdio>
#include<cstring>
#include<vector>
#include<queue>
#include<algorithm>
#include<stack>
#include<cmath>
#include<bits/stdc++.h>
using namespace std;

//long long a,b;
char a[888],b[888];
void YE5()
{
	cout<<"YE5";
} 
void N0()
{
	cout<<"N0";
}

int main()
{
	ios::sync_with_stdio(false);
	cin>>a>>b;
	if(strlen(a)<strlen(b)||(strlen(a)==strlen(b)&&strcmp(a,b)<=0)) YE5();
	else N0();
}