#include<bits/stdc++.h>
using namespace std;
int main(){
    int s1=0,s2=0,flag=0;
	string a,b;
	getline(cin,a);
	getline(cin,b);
	for(int i=0;i<a.size();i++){
		if(a[i]<='Z'&&a[i]>='A'){
			a[i]=a[i]+32;
		}
	}
	for(int i=0;i<b.size();i++){
		if(b[i]<='Z'&&b[i]>='A'){
			b[i]=b[i]+32;
		}
	}
    if(a.size()>b.size()){
        for(int i=0;i<a.size();i++){
            if(a[s1]==' '&&b[s2]==' '){
                s1++;
                s2++;
                continue;
            }
            if(a[s1]==' '){
                s1++;
                continue;
            }
            if(b[s2]==' '){
                s2++;
                continue;
            }
            if(a[s1]>b[s2]){
                flag=1;
                break;
            }
            if(a[s1]<b[s2]){
                flag=1;
                break;
            }
            s1++;
            s2++;
        }
        if(flag==0){
            cout<<"YES";
        }
        else if(flag==1){
            cout<<"NO";
        }
    }
    else if(a.size()<b.size()){
        for(int i=0;i<b.size();i++){
            if(a[s1]==' '&&b[s2]==' '){
                s1++;
                s2++;
                continue;
            }
            if(a[s1]==' '){
                s1++;
                continue;
            }
            if(b[s2]==' '){
                s2++;
                continue;
            }
            if(a[s1]>b[s2]){
                flag=1;
                break;
            }
            if(a[s1]<b[s2]){
                flag=1;
                break;
            }
            s1++;
            s2++;
        }
        if(flag==0){
            cout<<"YES";
        }
        else if(flag==1){
            cout<<"NO";
        }
    }
    else{
        for(int i=0;i<a.size();i++){
            if(a[s1]==' '&&b[s2]==' '){
                s1++;
                s2++;
                continue;
            }
            if(a[s1]==' '){
                s1++;
                continue;
            }
            if(b[s2]==' '){
                s2++;
                continue;
            }
            if(a[s1]>b[s2]){
                flag=1;
                break;
            }
            if(a[s1]<b[s2]){
                flag=1;
                break;
            }
            s1++;
            s2++;
        }
        if(flag==0){
            cout<<"YES";
        }
        else if(flag==1){
            cout<<"NO";
        }
    }
	return 0;
}