%{ 
	#include<stdio.h> 
	int num, r, digit=0, count, pcount=0, i; 
	char a[20]; 
%} 

DIGIT [0-9] 
/* Rule Section */
%% 

{DIGIT}+ { num=atoi(yytext); 

		while(num!=0) 
		{ 

			r=num%16; 
			digit='0'+r; 
			if(digit>'9') 
			digit+=7; 
			a[count++]=digit; 
			num=num/16; 

		} 

		for(i=count-1;i>=pcount;--i) 
				printf("%c", a[i]); 
				pcount=count; 
		}
		
%% 

// driver code 
int main() 
{ 
	yylex(); 
	return 0; 
}