#include<iostream>
using namespace std;
int main(){
	int m,n;
	cin>>m>>n;
	if(m==2){
		if(n<=4){
			cout<<"LC";
		}
		else if(n<=19){
			cout<<"YS";
		}
		else{
			cout<<"JZ";
		}
	}
	else if(m==3){
		if(n<=5){
			cout<<"JZ";
		}
		else if(n<=20){
			cout<<"CF";
		}
		else{
			cout<<"QM";
		}
	}
	else if(m==4){
		if(n<=4){
			cout<<"QM";
		}
		else if(n<=19){
			cout<<"GY";
		}
		else{
			cout<<"LX";
		}
	}
	else if(m==5){
		if(n<=5){
			cout<<"LX";
		}
		else if(n<=20){
			cout<<"XM";
		}
		else{
			cout<<"MZ";
		}
	}
	else if(m==6){
		if(n<=5){
			cout<<"MZ";
		}
		else if(n<=21){
			cout<<"XZ";
		}
		else{
			cout<<"XS";
		}
	}
	else if(m==7){
		if(n<=6){
			cout<<"XS";
		}
		//XZ
		else if(n<=22){
			cout<<"DS";
		}
		else{
			cout<<"LQ";
		}
	}
	else if(m==8){
		if(n<=7){
			cout<<"LQ";
		}
		else if(n<=22){
			cout<<"CS";
		}
		else{
			cout<<"BL";
		}
	}
	else if(m==9){
		if(n<=7){
			cout<<"BL";
		}
		else if(n<=22){
			cout<<"QF";
		}
		else{
			cout<<"HL";
		}
	}
	else if(m==10){
		if(n<=8){
			cout<<"HL";
		}
		else if(n<=23){
			cout<<"SJ";
		}
		else{
			cout<<"LD";
		}
	}
	else if(m==11){
		if(n<=7){
			cout<<"LD";
		}
		else if(n<=22){
			cout<<"XX";
		}
		else{
			cout<<"DX";
		}
	}
	else if(m==12){
		if(n<=7){
			cout<<"DX";
		}
		else if(n<=21){
			cout<<"DZ";
		}
		else{
			cout<<"XH";
		}
	}
	else if(m==1){
		if(n<=5){
			cout<<"XH";
		}
		else if(n<=20){
			cout<<"DH";
		}
		else{
			cout<<"LC"; 
		}
	}
}