#include<stdio.h>
#include<stdlib.h>
#include<string.h>

main()
	{
               
		int i;
		char str[10];
		label:
		printf(">>");
		scanf("%s",str);
		i=strcmp("ls",str);
			if (strcmp("ls",str)==0)
				system("ls");
			else if(strcmp("pwd",str)==0)
			     system("pwd");
            else if(strcmp("exit",str)==0)
                 return(0);
            else
				printf("Command Not Found\n");
				
		goto label;
			
	}