**** 1 ****
/> 6400
25600
24100
6381
1024
8192
1600
/> 
**** 2 ****
/> Pwd
/> 
**** 3 ****
/> List
/> 
**** 4 ****
/> Cd
/> No such a directory
/> Cd
/> 
**** 5 ****
/> Cd
/> Cd
/> Cd
/> Pwd
/> Cd
/> 
**** 6 ****
/> Cd
/> List
/> No such a directory
/> Cd
/> List
/> 
**** 7 ****
/> Cd
/> 
**** 8 ****
/> Recover
/> 
**** 9 ****
/> Recover
/>